Merge branch 'maint'

* maint: (46 commits)
  git-gui: Changed blame header bar background to match main window
  git-gui: Favor the original annotations over the recent ones
  git-gui: Improve our labeling of blame annotation types
  git-gui: Use three colors for the blame viewer background
  git-gui: Jump to original line in blame viewer
  git-gui: Display both commits in our tooltips
  git-gui: Run blame twice on the same file and display both outputs
  git-gui: Display the "Loading annotation..." message in italic
  git-gui: Rename fields in blame viewer to better descriptions
  git-gui: Label the uncommitted blame history entry
  git-gui: Switch internal blame structure to Tcl lists
  git-gui: Cleanup redundant column management in blame viewer
  git-gui: Better document our blame variables
  git-gui: Remove unused commit_list from blame viewer
  git-gui: Automatically expand the line number column as needed
  git-gui: Make the line number column slightly wider in blame
  git-gui: Use lighter colors in blame view
  git-gui: Remove unnecessary space between columns in blame viewer
  git-gui: Remove the loaded column from the blame viewer
  git-gui: Clip the commit summaries in the blame history menu
  ...

5 files changed, 825 insertions, 219 deletions

diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index dba585111c..dfb4b955eb 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -22,6 +22,22 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA}
 
 ######################################################################
 ##
+## Tcl/Tk sanity check
+
+if {[catch {package require Tcl 8.4} err]
+ || [catch {package require Tk  8.4} err]
+} {
+	catch {wm withdraw .}
+	tk_messageBox \
+		-icon error \
+		-type ok \
+		-title "git-gui: fatal error" \
+		-message $err
+	exit 1
+}
+
+######################################################################
+##
 ## configure our library
 
 set oguilib {@@GITGUI_LIBDIR@@}
@@ -1008,6 +1024,7 @@ proc incr_font_size {font {amt 1}} {
 	incr sz $amt
 	font configure $font -size $sz
 	font configure ${font}bold -size $sz
+	font configure ${font}italic -size $sz
 }
 
 ######################################################################
@@ -1200,12 +1217,14 @@ catch {
 	destroy .dummy
 }
 
+font create font_uiitalic
 font create font_uibold
 font create font_diffbold
+font create font_diffitalic
 
 foreach class {Button Checkbutton Entry Label
 		Labelframe Listbox Menu Message
-		Radiobutton Text} {
+		Radiobutton Spinbox Text} {
 	option add *$class.font font_ui
 }
 unset class
@@ -1233,8 +1252,10 @@ proc apply_config {} {
 		}
 		foreach {cn cv} [font configure $font] {
 			font configure ${font}bold $cn $cv
+			font configure ${font}italic $cn $cv
 		}
 		font configure ${font}bold -weight bold
+		font configure ${font}italic -slant italic
 	}
 }
 
@@ -1600,7 +1621,7 @@ unset browser doc_path doc_url
 
 # -- Standard bindings
 #
-bind .   <Destroy> do_quit
+bind .   <Destroy> {if {{%W} eq {.}} do_quit}
 bind all <$M1B-Key-q> do_quit
 bind all <$M1B-Key-Q> do_quit
 bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
@@ -1715,7 +1736,7 @@ pack .vpane -anchor n -side top -fill both -expand 1
 #
 frame .vpane.files.index -height 100 -width 200
 label .vpane.files.index.title -text {Staged Changes (Will Be Committed)} \
-	-background green
+	-background lightgreen
 text $ui_index -background white -borderwidth 0 \
 	-width 20 -height 10 \
 	-wrap none \
@@ -1735,7 +1756,7 @@ pack $ui_index -side left -fill both -expand 1
 #
 frame .vpane.files.workdir -height 100 -width 200
 label .vpane.files.workdir.title -text {Unstaged Changes (Will Not Be Committed)} \
-	-background red
+	-background lightsalmon
 text $ui_workdir -background white -borderwidth 0 \
 	-width 20 -height 10 \
 	-wrap none \
@@ -1752,10 +1773,8 @@ pack $ui_workdir -side left -fill both -expand 1
 .vpane.files add .vpane.files.workdir -sticky nsew
 
 foreach i [list $ui_index $ui_workdir] {
-	$i tag conf in_diff -font font_uibold
-	$i tag conf in_sel \
-		-background [$i cget -foreground] \
-		-foreground [$i cget -background]
+	$i tag conf in_diff -background lightgray
+	$i tag conf in_sel  -background lightgray
 }
 unset i
 
@@ -1913,18 +1932,18 @@ proc trace_current_diff_path {varname args} {
 }
 trace add variable current_diff_path write trace_current_diff_path
 
-frame .vpane.lower.diff.header -background orange
+frame .vpane.lower.diff.header -background gold
 label .vpane.lower.diff.header.status \
-	-background orange \
+	-background gold \
 	-width $max_status_desc \
 	-anchor w \
 	-justify left
 label .vpane.lower.diff.header.file \
-	-background orange \
+	-background gold \
 	-anchor w \
 	-justify left
 label .vpane.lower.diff.header.path \
-	-background orange \
+	-background gold \
 	-anchor w \
 	-justify left
 pack .vpane.lower.diff.header.status -side left
@@ -2038,17 +2057,17 @@ lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
 $ctxm add separator
 $ctxm add command \
 	-label {Show Less Context} \
-	-command {if {$repo_config(gui.diffcontext) >= 2} {
+	-command {if {$repo_config(gui.diffcontext) >= 1} {
 		incr repo_config(gui.diffcontext) -1
 		reshow_diff
 	}}
 lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
 $ctxm add command \
 	-label {Show More Context} \
-	-command {
+	-command {if {$repo_config(gui.diffcontext) < 99} {
 		incr repo_config(gui.diffcontext)
 		reshow_diff
-	}
+	}}
 lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
 $ctxm add separator
 $ctxm add command -label {Options...} \
diff --git a/git-gui/lib/blame.tcl b/git-gui/lib/blame.tcl
index 8b032d9590..98687c77da 100644
--- a/git-gui/lib/blame.tcl
+++ b/git-gui/lib/blame.tcl
@@ -3,145 +3,270 @@
 
 class blame {
 
-field commit  ; # input commit to blame
-field path    ; # input filename to view in $commit
+image create photo ::blame::img_back_arrow -data {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}
+
+# Persistant data (survives loads)
+#
+field history {}; # viewer history: {commit path}
+field header    ; # array commit,key -> header field
+
+# Tk UI control paths
+#
+field w          ; # top window in this viewer
+field w_back     ; # our back button
+field w_path     ; # label showing the current file path
+field w_columns  ; # list of all column widgets in the viewer
+field w_line     ; # text column: all line numbers
+field w_amov     ; # text column: annotations + move tracking
+field w_asim     ; # text column: annotations (simple computation)
+field w_file     ; # text column: actual file data
+field w_cviewer  ; # pane showing commit message
+field status     ; # text variable bound to status bar
+field old_height ; # last known height of $w.file_pane
+
+# Tk UI colors
+#
+variable active_color #c0edc5
+variable group_colors {
+	#d6d6d6
+	#e1e1e1
+	#ececec
+}
 
-field w
-field w_line
-field w_load
-field w_file
-field w_cmit
-field status
+# Current blame data; cleared/reset on each load
+#
+field commit               ; # input commit to blame
+field path                 ; # input filename to view in $commit
 
-field highlight_line   -1 ; # current line selected
-field highlight_commit {} ; # sha1 of commit selected
+field current_fd        {} ; # background process running
+field highlight_line    -1 ; # current line selected
+field highlight_column  {} ; # current commit column selected
+field highlight_commit  {} ; # sha1 of commit selected
 
 field total_lines       0  ; # total length of file
 field blame_lines       0  ; # number of lines computed
-field commit_count      0  ; # number of commits in $commit_list
-field commit_list      {}  ; # list of commit sha1 in receipt order
-field order                ; # array commit -> receipt order
-field header               ; # array commit,key -> header field
-field line_commit          ; # array line -> sha1 commit
-field line_file            ; # array line -> file name
-
-field r_commit      ; # commit currently being parsed
-field r_orig_line   ; # original line number
-field r_final_line  ; # final line number
-field r_line_count  ; # lines in this region
+field amov_data            ; # list of {commit origfile origline}
+field asim_data            ; # list of {commit origfile origline}
+
+field r_commit             ; # commit currently being parsed
+field r_orig_line          ; # original line number
+field r_final_line         ; # final line number
+field r_line_count         ; # lines in this region
+
+field tooltip_wm        {} ; # Current tooltip toplevel, if open
+field tooltip_t         {} ; # Text widget in $tooltip_wm
+field tooltip_timer     {} ; # Current timer event for our tooltip
+field tooltip_commit    {} ; # Commit(s) in tooltip
 
 constructor new {i_commit i_path} {
+	global cursor_ptr
+	variable active_color
+	variable group_colors
+
 	set commit $i_commit
 	set path   $i_path
 
 	make_toplevel top w
 	wm title $top "[appname] ([reponame]): File Viewer"
-	set status "Loading $commit:$path..."
 
-	label $w.path -text "$commit:$path" \
+	frame $w.header -background gold
+	label $w.header.commit_l \
+		-text {Commit:} \
+		-background gold \
 		-anchor w \
-		-justify left \
-		-borderwidth 1 \
-		-relief sunken \
-		-font font_uibold
-	pack $w.path -side top -fill x
-
-	frame $w.out
-	text $w.out.loaded_t \
+		-justify left
+	set w_back $w.header.commit_b
+	label $w_back \
+		-image ::blame::img_back_arrow \
+		-borderwidth 0 \
+		-relief flat \
+		-state disabled \
+		-background gold \
+		-activebackground gold
+	bind $w_back <Button-1> "
+		if {\[$w_back cget -state\] eq {normal}} {
+			[cb _history_menu]
+		}
+		"
+	label $w.header.commit \
+		-textvariable @commit \
+		-background gold \
+		-anchor w \
+		-justify left
+	label $w.header.path_l \
+		-text {File:} \
+		-background gold \
+		-anchor w \
+		-justify left
+	set w_path $w.header.path
+	label $w_path \
+		-background gold \
+		-anchor w \
+		-justify left
+	pack $w.header.commit_l -side left
+	pack $w_back -side left
+	pack $w.header.commit -side left
+	pack $w_path -fill x -side right
+	pack $w.header.path_l -side right
+
+	panedwindow $w.file_pane -orient vertical
+	frame $w.file_pane.out
+	frame $w.file_pane.cm
+	$w.file_pane add $w.file_pane.out \
+		-sticky nsew \
+		-minsize 100 \
+		-height 100 \
+		-width 100
+	$w.file_pane add $w.file_pane.cm \
+		-sticky nsew \
+		-minsize 25 \
+		-height 25 \
+		-width 100
+
+	set w_line $w.file_pane.out.linenumber_t
+	text $w_line \
+		-takefocus 0 \
+		-highlightthickness 0 \
+		-padx 0 -pady 0 \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
-		-width 1 \
+		-width 6 \
 		-font font_diff
-	$w.out.loaded_t tag conf annotated -background grey
+	$w_line tag conf linenumber -justify right -rmargin 5
 
-	text $w.out.linenumber_t \
+	set w_amov $w.file_pane.out.amove_t
+	text $w_amov \
+		-takefocus 0 \
+		-highlightthickness 0 \
+		-padx 0 -pady 0 \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 5 \
 		-font font_diff
-	$w.out.linenumber_t tag conf linenumber -justify right
-
-	text $w.out.file_t \
+	$w_amov tag conf author_abbr -justify right -rmargin 5
+	$w_amov tag conf curr_commit
+	$w_amov tag conf prior_commit -foreground blue -underline 1
+	$w_amov tag bind prior_commit \
+		<Button-1> \
+		"[cb _load_commit $w_amov @amov_data @%x,%y];break"
+
+	set w_asim $w.file_pane.out.asimple_t
+	text $w_asim \
+		-takefocus 0 \
+		-highlightthickness 0 \
+		-padx 0 -pady 0 \
+		-background white -borderwidth 0 \
+		-state disabled \
+		-wrap none \
+		-height 40 \
+		-width 4 \
+		-font font_diff
+	$w_asim tag conf author_abbr -justify right
+	$w_asim tag conf curr_commit
+	$w_asim tag conf prior_commit -foreground blue -underline 1
+	$w_asim tag bind prior_commit \
+		<Button-1> \
+		"[cb _load_commit $w_asim @asim_data @%x,%y];break"
+
+	set w_file $w.file_pane.out.file_t
+	text $w_file \
+		-takefocus 0 \
+		-highlightthickness 0 \
+		-padx 0 -pady 0 \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 40 \
 		-width 80 \
-		-xscrollcommand [list $w.out.sbx set] \
+		-xscrollcommand [list $w.file_pane.out.sbx set] \
 		-font font_diff
 
-	scrollbar $w.out.sbx -orient h -command [list $w.out.file_t xview]
-	scrollbar $w.out.sby -orient v \
-		-command [list scrollbar2many [list \
-		$w.out.loaded_t \
-		$w.out.linenumber_t \
-		$w.out.file_t \
-		] yview]
-	grid \
-		$w.out.linenumber_t \
-		$w.out.loaded_t \
-		$w.out.file_t \
-		$w.out.sby \
-		-sticky nsew
-	grid conf $w.out.sbx -column 2 -sticky we
-	grid columnconfigure $w.out 2 -weight 1
-	grid rowconfigure $w.out 0 -weight 1
-	pack $w.out -fill both -expand 1
-
-	label $w.status \
-		-textvariable @status \
-		-anchor w \
-		-justify left \
-		-borderwidth 1 \
-		-relief sunken
-	pack $w.status -side bottom -fill x
-
-	frame $w.cm
-	text $w.cm.t \
+	set w_columns [list $w_amov $w_asim $w_line $w_file]
+
+	scrollbar $w.file_pane.out.sbx \
+		-orient h \
+		-command [list $w_file xview]
+	scrollbar $w.file_pane.out.sby \
+		-orient v \
+		-command [list scrollbar2many $w_columns yview]
+	eval grid $w_columns $w.file_pane.out.sby -sticky nsew
+	grid conf \
+		$w.file_pane.out.sbx \
+		-column [expr {[llength $w_columns] - 1}] \
+		-sticky we
+	grid columnconfigure \
+		$w.file_pane.out \
+		[expr {[llength $w_columns] - 1}] \
+		-weight 1
+	grid rowconfigure $w.file_pane.out 0 -weight 1
+
+	set w_cviewer $w.file_pane.cm.t
+	text $w_cviewer \
 		-background white -borderwidth 0 \
 		-state disabled \
 		-wrap none \
 		-height 10 \
 		-width 80 \
-		-xscrollcommand [list $w.cm.sbx set] \
-		-yscrollcommand [list $w.cm.sby set] \
+		-xscrollcommand [list $w.file_pane.cm.sbx set] \
+		-yscrollcommand [list $w.file_pane.cm.sby set] \
 		-font font_diff
-	scrollbar $w.cm.sbx -orient h -command [list $w.cm.t xview]
-	scrollbar $w.cm.sby -orient v -command [list $w.cm.t yview]
-	pack $w.cm.sby -side right -fill y
-	pack $w.cm.sbx -side bottom -fill x
-	pack $w.cm.t -expand 1 -fill both
-	pack $w.cm -side bottom -fill x
+	$w_cviewer tag conf still_loading \
+		-font font_uiitalic \
+		-justify center
+	$w_cviewer tag conf header_key \
+		-tabs {3c} \
+		-background $active_color \
+		-font font_uibold
+	$w_cviewer tag conf header_val \
+		-background $active_color \
+		-font font_ui
+	$w_cviewer tag raise sel
+	scrollbar $w.file_pane.cm.sbx \
+		-orient h \
+		-command [list $w_cviewer xview]
+	scrollbar $w.file_pane.cm.sby \
+		-orient v \
+		-command [list $w_cviewer yview]
+	pack $w.file_pane.cm.sby -side right -fill y
+	pack $w.file_pane.cm.sbx -side bottom -fill x
+	pack $w_cviewer -expand 1 -fill both
+
+	frame $w.status \
+		-borderwidth 1 \
+		-relief sunken
+	label $w.status.l \
+		-textvariable @status \
+		-anchor w \
+		-justify left
+	pack $w.status.l -side left
 
 	menu $w.ctxm -tearoff 0
 	$w.ctxm add command \
 		-label "Copy Commit" \
 		-command [cb _copycommit]
 
-	set w_line $w.out.linenumber_t
-	set w_load $w.out.loaded_t
-	set w_file $w.out.file_t
-	set w_cmit $w.cm.t
-
-	foreach i [list \
-		$w.out.loaded_t \
-		$w.out.linenumber_t \
-		$w.out.file_t] {
-		$i tag conf in_sel \
-			-background [$i cget -foreground] \
-			-foreground [$i cget -background]
-		$i conf -yscrollcommand \
-			[list many2scrollbar [list \
-			$w.out.loaded_t \
-			$w.out.linenumber_t \
-			$w.out.file_t \
-			] yview $w.out.sby]
-		bind $i <Button-1> "[cb _click $i @%x,%y]; focus $i"
+	foreach i $w_columns {
+		for {set g 0} {$g < [llength $group_colors]} {incr g} {
+			$i tag conf color$g -background [lindex $group_colors $g]
+		}
+
+		$i conf -cursor $cursor_ptr
+		$i conf -yscrollcommand [list many2scrollbar \
+			$w_columns yview $w.file_pane.out.sby]
+		bind $i <Button-1> "
+			[cb _hide_tooltip]
+			[cb _click $i @%x,%y]
+			focus $i
+		"
+		bind $i <Any-Motion>  [cb _show_tooltip $i @%x,%y]
+		bind $i <Any-Enter>   [cb _hide_tooltip]
+		bind $i <Any-Leave>   [cb _hide_tooltip]
 		bind_button3 $i "
+			[cb _hide_tooltip]
 			set cursorX %x
 			set cursorY %y
 			set cursorW %W
@@ -149,11 +274,7 @@ constructor new {i_commit i_path} {
 		"
 	}
 
-	foreach i [list \
-		$w.out.loaded_t \
-		$w.out.linenumber_t \
-		$w.out.file_t \
-		$w.cm.t] {
+	foreach i [concat $w_columns $w_cviewer] {
 		bind $i <Key-Up>        {catch {%W yview scroll -1 units};break}
 		bind $i <Key-Down>      {catch {%W yview scroll  1 units};break}
 		bind $i <Key-Left>      {catch {%W xview scroll -1 units};break}
@@ -166,10 +287,96 @@ constructor new {i_commit i_path} {
 		bind $i <Control-Key-f> {catch {%W yview scroll  1 pages};break}
 	}
 
-	bind $w.cm.t <Button-1> [list focus $w.cm.t]
+	bind $w_cviewer <Button-1> [list focus $w_cviewer]
 	bind $top <Visibility> [list focus $top]
-	bind $top <Destroy> [list delete_this $this]
+	bind $w_file <Destroy> [list delete_this $this]
+
+	grid configure $w.header -sticky ew
+	grid configure $w.file_pane -sticky nsew
+	grid configure $w.status -sticky ew
+	grid columnconfigure $top 0 -weight 1
+	grid rowconfigure $top 0 -weight 0
+	grid rowconfigure $top 1 -weight 1
+	grid rowconfigure $top 2 -weight 0
+
+	set req_w [winfo reqwidth  $top]
+	set req_h [winfo reqheight $top]
+	if {$req_w < 600} {set req_w 600}
+	if {$req_h < 400} {set req_h 400}
+	set g "${req_w}x${req_h}"
+	wm geometry $top $g
+	update
+
+	set old_height [winfo height $w.file_pane]
+	$w.file_pane sash place 0 \
+		[lindex [$w.file_pane sash coord 0] 0] \
+		[expr {int($old_height * 0.70)}]
+	bind $w.file_pane <Configure> \
+	"if {{$w.file_pane} eq {%W}} {[cb _resize %h]}"
+
+	_load $this {}
+}
+
+method _load {jump} {
+	variable group_colors
 
+	_hide_tooltip $this
+
+	if {$total_lines != 0 || $current_fd ne {}} {
+		if {$current_fd ne {}} {
+			catch {close $current_fd}
+			set current_fd {}
+		}
+
+		foreach i $w_columns {
+			$i conf -state normal
+			$i delete 0.0 end
+			foreach g [$i tag names] {
+				if {[regexp {^g[0-9a-f]{40}$} $g]} {
+					$i tag delete $g
+				}
+			}
+			$i conf -state disabled
+		}
+
+		$w_cviewer conf -state normal
+		$w_cviewer delete 0.0 end
+		$w_cviewer conf -state disabled
+
+		set highlight_line -1
+		set highlight_column {}
+		set highlight_commit {}
+		set total_lines 0
+	}
+
+	if {[winfo exists $w.status.c]} {
+		$w.status.c coords bar 0 0 0 20
+	} else {
+		canvas $w.status.c \
+			-width 100 \
+			-height [expr {int([winfo reqheight $w.status.l] * 0.6)}] \
+			-borderwidth 1 \
+			-relief groove \
+			-highlightt 0
+		$w.status.c create rectangle 0 0 0 20 -tags bar -fill navy
+		pack $w.status.c -side right
+	}
+
+	if {$history eq {}} {
+		$w_back conf -state disabled
+	} else {
+		$w_back conf -state normal
+	}
+
+	# Index 0 is always empty.  There is never line 0 as
+	# we use only 1 based lines, as that matches both with
+	# git-blame output and with Tk's text widget.
+	#
+	set amov_data [list [list]]
+	set asim_data [list [list]]
+
+	set status "Loading $commit:[escape_path $path]..."
+	$w_path conf -text [escape_path $path]
 	if {$commit eq {}} {
 		set fd [open $path r]
 	} else {
@@ -177,41 +384,133 @@ constructor new {i_commit i_path} {
 		set fd [open "| $cmd" r]
 	}
 	fconfigure $fd -blocking 0 -translation lf -encoding binary
-	fileevent $fd readable [cb _read_file $fd]
+	fileevent $fd readable [cb _read_file $fd $jump]
+	set current_fd $fd
+}
+
+method _history_menu {} {
+	set m $w.backmenu
+	if {[winfo exists $m]} {
+		$m delete 0 end
+	} else {
+		menu $m -tearoff 0
+	}
+
+	for {set i [expr {[llength $history] - 1}]
+		} {$i >= 0} {incr i -1} {
+		set e [lindex $history $i]
+		set c [lindex $e 0]
+		set f [lindex $e 1]
+
+		if {[regexp {^[0-9a-f]{40}$} $c]} {
+			set t [string range $c 0 8]...
+		} elseif {$c eq {}} {
+			set t {Working Directory}
+		} else {
+			set t $c
+		}
+		if {![catch {set summary $header($c,summary)}]} {
+			append t " $summary"
+			if {[string length $t] > 70} {
+				set t [string range $t 0 66]...
+			}
+		}
+
+		$m add command -label $t -command [cb _goback $i]
+	}
+	set X [winfo rootx $w_back]
+	set Y [expr {[winfo rooty $w_back] + [winfo height $w_back]}]
+	tk_popup $m $X $Y
+}
+
+method _goback {i} {
+	set dat [lindex $history $i]
+	set history [lrange $history 0 [expr {$i - 1}]]
+	set commit [lindex $dat 0]
+	set path [lindex $dat 1]
+	_load $this [lrange $dat 2 5]
 }
 
-method _read_file {fd} {
-	$w_load conf -state normal
-	$w_line conf -state normal
-	$w_file conf -state normal
+method _read_file {fd jump} {
+	if {$fd ne $current_fd} {
+		catch {close $fd}
+		return
+	}
+
+	foreach i $w_columns {$i conf -state normal}
 	while {[gets $fd line] >= 0} {
 		regsub "\r\$" $line {} line
 		incr total_lines
-		$w_load insert end "\n"
-		$w_line insert end "$total_lines\n" linenumber
-		$w_file insert end "$line\n"
+		lappend amov_data {}
+		lappend asim_data {}
+
+		if {$total_lines > 1} {
+			foreach i $w_columns {$i insert end "\n"}
+		}
+
+		$w_line insert end "$total_lines" linenumber
+		$w_file insert end "$line"
 	}
-	$w_load conf -state disabled
-	$w_line conf -state disabled
-	$w_file conf -state disabled
+
+	set ln_wc [expr {[string length $total_lines] + 2}]
+	if {[$w_line cget -width] < $ln_wc} {
+		$w_line conf -width $ln_wc
+	}
+
+	foreach i $w_columns {$i conf -state disabled}
 
 	if {[eof $fd]} {
 		close $fd
-		_status $this
-		set cmd [list git blame -M -C --incremental]
-		if {$commit eq {}} {
-			lappend cmd --contents $path
-		} else {
-			lappend cmd $commit
+
+		# If we don't force Tk to update the widgets *right now*
+		# none of our jump commands will cause a change in the UI.
+		#
+		update
+
+		if {[llength $jump] == 1} {
+			set highlight_line [lindex $jump 0]
+			$w_file see "$highlight_line.0"
+		} elseif {[llength $jump] == 4} {
+			set highlight_column [lindex $jump 0]
+			set highlight_line [lindex $jump 1]
+			$w_file xview moveto [lindex $jump 2]
+			$w_file yview moveto [lindex $jump 3]
 		}
-		lappend cmd -- $path
-		set fd [open "| $cmd" r]
-		fconfigure $fd -blocking 0 -translation lf -encoding binary
-		fileevent $fd readable [cb _read_blame $fd]
+
+		_exec_blame $this $w_asim @asim_data \
+			[list] \
+			{ copy/move tracking}
 	}
 } ifdeleted { catch {close $fd} }
 
-method _read_blame {fd} {
+method _exec_blame {cur_w cur_d options cur_s} {
+	set cmd [list nice git blame]
+	set cmd [concat $cmd $options]
+	lappend cmd --incremental
+	if {$commit eq {}} {
+		lappend cmd --contents $path
+	} else {
+		lappend cmd $commit
+	}
+	lappend cmd -- $path
+	set fd [open "| $cmd" r]
+	fconfigure $fd -blocking 0 -translation lf -encoding binary
+	fileevent $fd readable [cb _read_blame $fd $cur_w $cur_d $cur_s]
+	set current_fd $fd
+	set blame_lines 0
+	_status $this $cur_s
+}
+
+method _read_blame {fd cur_w cur_d cur_s} {
+	upvar #0 $cur_d line_data
+	variable group_colors
+
+	if {$fd ne $current_fd} {
+		catch {close $fd}
+		return
+	}
+
+	$cur_w conf -state normal
 	while {[gets $fd line] >= 0} {
 		if {[regexp {^([a-z0-9]{40}) (\d+) (\d+) (\d+)$} $line line \
 			cmit original_line final_line line_count]} {
@@ -219,127 +518,240 @@ method _read_blame {fd} {
 			set r_orig_line  $original_line
 			set r_final_line $final_line
 			set r_line_count $line_count
-
-			if {[catch {set g $order($cmit)}]} {
-				$w_line tag conf g$cmit
-				$w_file tag conf g$cmit
-				$w_line tag raise in_sel
-				$w_file tag raise in_sel
-				$w_file tag raise sel
-				set order($cmit) $commit_count
-				incr commit_count
-				lappend commit_list $cmit
-			}
 		} elseif {[string match {filename *} $line]} {
 			set file [string range $line 9 end]
 			set n    $r_line_count
 			set lno  $r_final_line
+			set oln  $r_orig_line
 			set cmit $r_commit
 
+			if {[regexp {^0{40}$} $cmit]} {
+				set commit_abbr work
+				set commit_type curr_commit
+			} elseif {$cmit eq $commit} {
+				set commit_abbr this
+				set commit_type curr_commit
+			} else {
+				set commit_type prior_commit
+				set commit_abbr [string range $cmit 0 3]
+			}
+
+			set author_abbr {}
+			set a_name {}
+			catch {set a_name $header($cmit,author)}
+			while {$a_name ne {}} {
+				if {![regexp {^([[:upper:]])} $a_name _a]} break
+				append author_abbr $_a
+				unset _a
+				if {![regsub \
+					{^[[:upper:]][^\s]*\s+} \
+					$a_name {} a_name ]} break
+			}
+			if {$author_abbr eq {}} {
+				set author_abbr { |}
+			} else {
+				set author_abbr [string range $author_abbr 0 3]
+			}
+			unset a_name
+
+			set first_lno $lno
+			while {
+			   $first_lno > 1
+			&& $cmit eq [lindex $line_data [expr {$first_lno - 1}] 0]
+			&& $file eq [lindex $line_data [expr {$first_lno - 1}] 1]
+			} {
+				incr first_lno -1
+			}
+
+			set color {}
+			if {$first_lno < $lno} {
+				foreach g [$w_file tag names $first_lno.0] {
+					if {[regexp {^color[0-9]+$} $g]} {
+						set color $g
+						break
+					}
+				}
+			} else {
+				set i [lsort [concat \
+					[$w_file tag names "[expr {$first_lno - 1}].0"] \
+					[$w_file tag names "[expr {$lno + $n}].0"] \
+					]]
+				for {set g 0} {$g < [llength $group_colors]} {incr g} {
+					if {[lsearch -sorted -exact $i color$g] == -1} {
+						set color color$g
+						break
+					}
+				}
+			}
+			if {$color eq {}} {
+				set color color0
+			}
+
 			while {$n > 0} {
 				set lno_e "$lno.0 lineend + 1c"
-				if {[catch {set g g$line_commit($lno)}]} {
-					$w_load tag add annotated $lno.0 $lno_e
+				if {[lindex $line_data $lno] ne {}} {
+					set g [lindex $line_data $lno 0]
+					foreach i $w_columns {
+						$i tag remove g$g $lno.0 $lno_e
+					}
+				}
+				lset line_data $lno [list $cmit $file $oln]
+
+				$cur_w delete $lno.0 "$lno.0 lineend"
+				if {$lno == $first_lno} {
+					$cur_w insert $lno.0 $commit_abbr $commit_type
+				} elseif {$lno == [expr {$first_lno + 1}]} {
+					$cur_w insert $lno.0 $author_abbr author_abbr
 				} else {
-					$w_line tag remove g$g $lno.0 $lno_e
-					$w_file tag remove g$g $lno.0 $lno_e
+					$cur_w insert $lno.0 { |}
 				}
 
-				set line_commit($lno) $cmit
-				set line_file($lno)   $file
-				$w_line tag add g$cmit $lno.0 $lno_e
-				$w_file tag add g$cmit $lno.0 $lno_e
+				foreach i $w_columns {
+					if {$cur_w eq $w_amov} {
+						for {set g 0} \
+							{$g < [llength $group_colors]} \
+							{incr g} {
+							$i tag remove color$g $lno.0 $lno_e
+						}
+						$i tag add $color $lno.0 $lno_e
+					}
+					$i tag add g$cmit $lno.0 $lno_e
+				}
 
-				if {$highlight_line == -1} {
-					if {[lindex [$w_file yview] 0] == 0} {
+				if {$highlight_column eq $cur_w} {
+					if {$highlight_line == -1
+					 && [lindex [$w_file yview] 0] == 0} {
 						$w_file see $lno.0
-						_showcommit $this $lno
+						set highlight_line $lno
+					}
+					if {$highlight_line == $lno} {
+						_showcommit $this $cur_w $lno
 					}
-				} elseif {$highlight_line == $lno} {
-					_showcommit $this $lno
 				}
 
 				incr n -1
 				incr lno
+				incr oln
 				incr blame_lines
 			}
 
-			set hc $highlight_commit
-			if {$hc ne {}
-				&& [expr {$order($hc) + 1}] == $order($cmit)} {
-				_showcommit $this $highlight_line
+			while {
+			   $cmit eq [lindex $line_data $lno 0]
+			&& $file eq [lindex $line_data $lno 1]
+			} {
+				$cur_w delete $lno.0 "$lno.0 lineend"
+
+				if {$lno == $first_lno} {
+					$cur_w insert $lno.0 $commit_abbr $commit_type
+				} elseif {$lno == [expr {$first_lno + 1}]} {
+					$cur_w insert $lno.0 $author_abbr author_abbr
+				} else {
+					$cur_w insert $lno.0 { |}
+				}
+
+				if {$cur_w eq $w_amov} {
+					foreach i $w_columns {
+						for {set g 0} \
+							{$g < [llength $group_colors]} \
+							{incr g} {
+							$i tag remove color$g $lno.0 $lno_e
+						}
+						$i tag add $color $lno.0 $lno_e
+					}
+				}
+
+				incr lno
 			}
+
 		} elseif {[regexp {^([a-z-]+) (.*)$} $line line key data]} {
 			set header($r_commit,$key) $data
 		}
 	}
+	$cur_w conf -state disabled
 
 	if {[eof $fd]} {
 		close $fd
-		set status {Annotation complete.}
+		if {$cur_w eq $w_asim} {
+			_exec_blame $this $w_amov @amov_data \
+				[list -M -C -C] \
+				{ original location}
+		} else {
+			set current_fd {}
+			set status {Annotation complete.}
+			destroy $w.status.c
+		}
 	} else {
-		_status $this
+		_status $this $cur_s
 	}
 } ifdeleted { catch {close $fd} }
 
-method _status {} {
+method _status {cur_s} {
 	set have  $blame_lines
 	set total $total_lines
 	set pdone 0
 	if {$total} {set pdone [expr {100 * $have / $total}]}
 
 	set status [format \
-		"Loading annotations... %i of %i lines annotated (%2i%%)" \
-		$have $total $pdone]
+		"Loading%s annotations... %i of %i lines annotated (%2i%%)" \
+		$cur_s $have $total $pdone]
+	$w.status.c coords bar 0 0 $pdone 20
 }
 
 method _click {cur_w pos} {
 	set lno [lindex [split [$cur_w index $pos] .] 0]
-	if {$lno eq {}} return
-
-	set lno_e "$lno.0 + 1 line"
-	$w_line tag remove in_sel 0.0 end
-	$w_file tag remove in_sel 0.0 end
-	$w_line tag add in_sel $lno.0 $lno_e
-	$w_file tag add in_sel $lno.0 $lno_e
-
-	_showcommit $this $lno
+	_showcommit $this $cur_w $lno
 }
 
-variable blame_colors {
-	#ff4040
-	#ff40ff
-	#4040ff
+method _load_commit {cur_w cur_d pos} {
+	upvar #0 $cur_d line_data
+	set lno [lindex [split [$cur_w index $pos] .] 0]
+	set dat [lindex $line_data $lno]
+	if {$dat ne {}} {
+		lappend history [list \
+			$commit $path \
+			$highlight_column \
+			$highlight_line \
+			[lindex [$w_file xview] 0] \
+			[lindex [$w_file yview] 0] \
+			]
+		set commit [lindex $dat 0]
+		set path   [lindex $dat 1]
+		_load $this [list [lindex $dat 2]]
+	}
 }
 
-method _showcommit {lno} {
+method _showcommit {cur_w lno} {
 	global repo_config
-	variable blame_colors
+	variable active_color
 
 	if {$highlight_commit ne {}} {
-		set idx $order($highlight_commit)
-		set i 0
-		foreach c $blame_colors {
-			set h [lindex $commit_list [expr {$idx - 1 + $i}]]
-			$w_line tag conf g$h -background white
-			$w_file tag conf g$h -background white
-			incr i
+		foreach i $w_columns {
+			$i tag conf g$highlight_commit -background {}
+			$i tag lower g$highlight_commit
 		}
 	}
 
-	$w_cmit conf -state normal
-	$w_cmit delete 0.0 end
-	if {[catch {set cmit $line_commit($lno)}]} {
+	if {$cur_w eq $w_asim} {
+		set dat [lindex $asim_data $lno]
+		set highlight_column $w_asim
+	} else {
+		set dat [lindex $amov_data $lno]
+		set highlight_column $w_amov
+	}
+
+	$w_cviewer conf -state normal
+	$w_cviewer delete 0.0 end
+
+	if {$dat eq {}} {
 		set cmit {}
-		$w_cmit insert end "Loading annotation..."
+		$w_cviewer insert end "Loading annotation..." still_loading
 	} else {
-		set idx $order($cmit)
-		set i 0
-		foreach c $blame_colors {
-			set h [lindex $commit_list [expr {$idx - 1 + $i}]]
-			$w_line tag conf g$h -background $c
-			$w_file tag conf g$h -background $c
-			incr i
+		set cmit [lindex $dat 0]
+		set file [lindex $dat 1]
+
+		foreach i $w_columns {
+			$i tag conf g$cmit -background $active_color
+			$i tag raise g$cmit
 		}
 
 		set author_name {}
@@ -388,29 +800,199 @@ method _showcommit {lno} {
 			set header($cmit,message) $msg
 		}
 
-		$w_cmit insert end "commit $cmit
-Author: $author_name $author_email  $author_time
-Committer: $committer_name $committer_email  $committer_time
-Original File: [escape_path $line_file($lno)]
+		$w_cviewer insert end "commit $cmit\n" header_key
+		$w_cviewer insert end "Author:\t" header_key
+		$w_cviewer insert end "$author_name $author_email" header_val
+		$w_cviewer insert end "  $author_time\n" header_val
+
+		$w_cviewer insert end "Committer:\t" header_key
+		$w_cviewer insert end "$committer_name $committer_email" header_val
+		$w_cviewer insert end "  $committer_time\n" header_val
 
-$msg"
+		if {$file ne $path} {
+			$w_cviewer insert end "Original File:\t" header_key
+			$w_cviewer insert end "[escape_path $file]\n" header_val
+		}
+
+		$w_cviewer insert end "\n$msg"
 	}
-	$w_cmit conf -state disabled
+	$w_cviewer conf -state disabled
 
 	set highlight_line $lno
 	set highlight_commit $cmit
+
+	if {[lsearch -exact $tooltip_commit $highlight_commit] != -1} {
+		_hide_tooltip $this
+	}
 }
 
 method _copycommit {} {
 	set pos @$::cursorX,$::cursorY
 	set lno [lindex [split [$::cursorW index $pos] .] 0]
-	if {![catch {set commit $line_commit($lno)}]} {
+	set dat [lindex $amov_data $lno]
+	if {$dat ne {}} {
 		clipboard clear
 		clipboard append \
 			-format STRING \
 			-type STRING \
-			-- $commit
+			-- [lindex $dat 0]
 	}
 }
 
+method _show_tooltip {cur_w pos} {
+	if {$tooltip_wm ne {}} {
+		_open_tooltip $this $cur_w
+	} elseif {$tooltip_timer eq {}} {
+		set tooltip_timer [after 1000 [cb _open_tooltip $cur_w]]
+	}
+}
+
+method _open_tooltip {cur_w} {
+	set tooltip_timer {}
+	set pos_x [winfo pointerx $cur_w]
+	set pos_y [winfo pointery $cur_w]
+	if {[winfo containing $pos_x $pos_y] ne $cur_w} {
+		_hide_tooltip $this
+		return
+	}
+
+	if {$tooltip_wm ne "$cur_w.tooltip"} {
+		_hide_tooltip $this
+
+		set tooltip_wm [toplevel $cur_w.tooltip -borderwidth 1]
+		wm overrideredirect $tooltip_wm 1
+		wm transient $tooltip_wm [winfo toplevel $cur_w]
+		set tooltip_t $tooltip_wm.label
+		text $tooltip_t \
+			-takefocus 0 \
+			-highlightthickness 0 \
+			-relief flat \
+			-borderwidth 0 \
+			-wrap none \
+			-background lightyellow \
+			-foreground black
+		$tooltip_t tag conf section_header -font font_uibold
+		pack $tooltip_t
+	} else {
+		$tooltip_t conf -state normal
+		$tooltip_t delete 0.0 end
+	}
+
+	set pos @[join [list \
+		[expr {$pos_x - [winfo rootx $cur_w]}] \
+		[expr {$pos_y - [winfo rooty $cur_w]}]] ,]
+	set lno [lindex [split [$cur_w index $pos] .] 0]
+	if {$cur_w eq $w_amov} {
+		set dat [lindex $amov_data $lno]
+		set org {}
+	} else {
+		set dat [lindex $asim_data $lno]
+		set org [lindex $amov_data $lno]
+	}
+
+	set cmit [lindex $dat 0]
+	set tooltip_commit [list $cmit]
+
+	set author_name {}
+	set summary     {}
+	set author_time {}
+	catch {set author_name $header($cmit,author)}
+	catch {set summary     $header($cmit,summary)}
+	catch {set author_time [clock format \
+		$header($cmit,author-time) \
+		-format {%Y-%m-%d %H:%M:%S}
+	]}
+
+	$tooltip_t insert end "commit $cmit\n"
+	$tooltip_t insert end "$author_name  $author_time\n"
+	$tooltip_t insert end "$summary"
+
+	if {$org ne {} && [lindex $org 0] ne $cmit} {
+		set save [$tooltip_t get 0.0 end]
+		$tooltip_t delete 0.0 end
+
+		set cmit [lindex $org 0]
+		set file [lindex $org 1]
+		lappend tooltip_commit $cmit
+
+		set author_name {}
+		set summary     {}
+		set author_time {}
+		catch {set author_name $header($cmit,author)}
+		catch {set summary     $header($cmit,summary)}
+		catch {set author_time [clock format \
+			$header($cmit,author-time) \
+			-format {%Y-%m-%d %H:%M:%S}
+		]}
+
+		$tooltip_t insert end "Originally By:\n" section_header
+		$tooltip_t insert end "commit $cmit\n"
+		$tooltip_t insert end "$author_name  $author_time\n"
+		$tooltip_t insert end "$summary\n"
+
+		if {$file ne $path} {
+			$tooltip_t insert end "In File: " section_header
+			$tooltip_t insert end "$file\n"
+		}
+
+		$tooltip_t insert end "\n"
+		$tooltip_t insert end "Copied Or Moved Here By:\n" section_header
+		$tooltip_t insert end $save
+	}
+
+	$tooltip_t conf -state disabled
+	_position_tooltip $this
+}
+
+method _position_tooltip {} {
+	set max_h [lindex [split [$tooltip_t index end] .] 0]
+	set max_w 0
+	for {set i 1} {$i <= $max_h} {incr i} {
+		set c [lindex [split [$tooltip_t index "$i.0 lineend"] .] 1]
+		if {$c > $max_w} {set max_w $c}
+	}
+	$tooltip_t conf -width $max_w -height $max_h
+
+	set req_w [winfo reqwidth  $tooltip_t]
+	set req_h [winfo reqheight $tooltip_t]
+	set pos_x [expr {[winfo pointerx .] +  5}]
+	set pos_y [expr {[winfo pointery .] + 10}]
+
+	set g "${req_w}x${req_h}"
+	if {$pos_x >= 0} {append g +}
+	append g $pos_x
+	if {$pos_y >= 0} {append g +}
+	append g $pos_y
+
+	wm geometry $tooltip_wm $g
+	raise $tooltip_wm
+}
+
+method _hide_tooltip {} {
+	if {$tooltip_wm ne {}} {
+		destroy $tooltip_wm
+		set tooltip_wm {}
+		set tooltip_commit {}
+	}
+	if {$tooltip_timer ne {}} {
+		after cancel $tooltip_timer
+		set tooltip_timer {}
+	}
+}
+
+method _resize {new_height} {
+	set diff [expr {$new_height - $old_height}]
+	if {$diff == 0} return
+
+	set my [expr {[winfo height $w.file_pane] - 25}]
+	set o [$w.file_pane sash coord 0]
+	set ox [lindex $o 0]
+	set oy [expr {[lindex $o 1] + $diff}]
+	if {$oy < 0}   {set oy 0}
+	if {$oy > $my} {set oy $my}
+	$w.file_pane sash place 0 $ox $oy
+
+	set old_height $new_height
+}
+
 }
diff --git a/git-gui/lib/branch.tcl b/git-gui/lib/branch.tcl
index caaee5cf17..4f648b2bc7 100644
--- a/git-gui/lib/branch.tcl
+++ b/git-gui/lib/branch.tcl
@@ -201,12 +201,14 @@ proc do_create_branch {} {
 	pack $w.desc -anchor nw -fill x -pady 5 -padx 5
 
 	labelframe $w.from -text {Starting Revision}
-	radiobutton $w.from.head_r \
-		-text {Local Branch:} \
-		-value head \
-		-variable create_branch_revtype
-	eval tk_optionMenu $w.from.head_m create_branch_head $all_heads
-	grid $w.from.head_r $w.from.head_m -sticky w
+	if {$all_heads ne {}} {
+		radiobutton $w.from.head_r \
+			-text {Local Branch:} \
+			-value head \
+			-variable create_branch_revtype
+		eval tk_optionMenu $w.from.head_m create_branch_head $all_heads
+		grid $w.from.head_r $w.from.head_m -sticky w
+	}
 	set all_trackings [all_tracking_branches]
 	if {$all_trackings ne {}} {
 		set create_branch_trackinghead [lindex $all_trackings 0]
diff --git a/git-gui/lib/diff.tcl b/git-gui/lib/diff.tcl
index 7e715a6865..29436b50cb 100644
--- a/git-gui/lib/diff.tcl
+++ b/git-gui/lib/diff.tcl
@@ -145,7 +145,7 @@ proc show_diff {path w {lno {}}} {
 
 	lappend cmd -p
 	lappend cmd --no-color
-	if {$repo_config(gui.diffcontext) > 0} {
+	if {$repo_config(gui.diffcontext) >= 0} {
 		lappend cmd "-U$repo_config(gui.diffcontext)"
 	}
 	if {$w eq $ui_index} {
diff --git a/git-gui/lib/option.tcl b/git-gui/lib/option.tcl
index 17fcc65f78..b29e14e64d 100644
--- a/git-gui/lib/option.tcl
+++ b/git-gui/lib/option.tcl
@@ -15,6 +15,9 @@ proc save_config {} {
 		font configure ${font}bold \
 			-family $global_config_new(gui.$font^^family) \
 			-size $global_config_new(gui.$font^^size)
+		font configure ${font}italic \
+			-family $global_config_new(gui.$font^^family) \
+			-size $global_config_new(gui.$font^^size)
 		set global_config_new(gui.$name) [font configure $font]
 		unset global_config_new(gui.$font^^family)
 		unset global_config_new(gui.$font^^size)
@@ -173,7 +176,7 @@ proc do_options {} {
 		{i-1..5 merge.verbosity {Merge Verbosity}}
 
 		{b gui.trustmtime  {Trust File Modification Timestamps}}
-		{i-1..99 gui.diffcontext {Number of Diff Context Lines}}
+		{i-0..99 gui.diffcontext {Number of Diff Context Lines}}
 		{t gui.newbranchtemplate {New Branch Name Template}}
 		} {
 		set type [lindex $option 0]