From 2c019c8696ca56d1a9d1bb10fd1411bad14df0c6 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 6 Oct 2013 17:46:56 +0200
Subject: updated for version 7.4.052 Problem:    With 'fo' set to "a2"
 inserting a space in the first column may             cause the cursor to
 jump to the previous line. Solution:   Handle the case when there is no
 comment leader properly. (Tor             Perkins)  Also fix that cursor is
 in the wrong place when spaces             get replaced with a Tab.

---
 src/misc1.c           | 22 +++++++++++++++-------
 src/ops.c             | 18 ++++++++++++++++--
 src/testdir/test68.in | 14 ++++++++++++++
 src/testdir/test68.ok |  9 +++++++++
 src/version.c         |  2 ++
 5 files changed, 56 insertions(+), 9 deletions(-)

diff --git a/src/misc1.c b/src/misc1.c
index 0a2d83be0..2063d427e 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -303,10 +303,18 @@ set_indent(size, flags)
 	ml_replace(curwin->w_cursor.lnum, newline, FALSE);
 	if (flags & SIN_CHANGED)
 	    changed_bytes(curwin->w_cursor.lnum, 0);
-	/* Correct saved cursor position if it's after the indent. */
-	if (saved_cursor.lnum == curwin->w_cursor.lnum
-				&& saved_cursor.col >= (colnr_T)(p - oldline))
-	    saved_cursor.col += ind_len - (colnr_T)(p - oldline);
+	/* Correct saved cursor position if it is in this line. */
+	if (saved_cursor.lnum == curwin->w_cursor.lnum)
+	{
+	    if (saved_cursor.col >= (colnr_T)(p - oldline))
+		/* cursor was after the indent, adjust for the number of
+		 * bytes added/removed */
+		saved_cursor.col += ind_len - (colnr_T)(p - oldline);
+	    else if (saved_cursor.col >= (colnr_T)(s - newline))
+		/* cursor was in the indent, and is now after it, put it back
+		 * at the start of the indent (replacing spaces with TAB) */
+		saved_cursor.col = (colnr_T)(s - newline);
+	}
 	retval = TRUE;
     }
     else
@@ -1581,9 +1589,9 @@ theend:
 
 #if defined(FEAT_COMMENTS) || defined(PROTO)
 /*
- * get_leader_len() returns the length of the prefix of the given string
- * which introduces a comment.	If this string is not a comment then 0 is
- * returned.
+ * get_leader_len() returns the length in bytes of the prefix of the given
+ * string which introduces a comment.  If this string is not a comment then
+ * 0 is returned.
  * When "flags" is not NULL, it is set to point to the flags of the recognized
  * comment leader.
  * "backward" must be true for the "O" command.
diff --git a/src/ops.c b/src/ops.c
index b1f75a1ea..91d3a4b0f 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -4989,7 +4989,7 @@ format_lines(line_count, avoid_fex)
 
 	    /*
 	     * When still in same paragraph, join the lines together.  But
-	     * first delete the comment leader from the second line.
+	     * first delete the leader from the second line.
 	     */
 	    if (!is_end_par)
 	    {
@@ -4999,11 +4999,25 @@ format_lines(line_count, avoid_fex)
 		if (line_count < 0 && u_save_cursor() == FAIL)
 		    break;
 #ifdef FEAT_COMMENTS
-		(void)del_bytes((long)next_leader_len, FALSE, FALSE);
 		if (next_leader_len > 0)
+		{
+		    (void)del_bytes((long)next_leader_len, FALSE, FALSE);
 		    mark_col_adjust(curwin->w_cursor.lnum, (colnr_T)0, 0L,
 						      (long)-next_leader_len);
+		} else
 #endif
+		    if (second_indent > 0)  /* the "leader" for FO_Q_SECOND */
+		{
+		    char_u *p = ml_get_curline();
+		    int indent = skipwhite(p) - p;
+
+		    if (indent > 0)
+		    {
+			(void)del_bytes(indent, FALSE, FALSE);
+			mark_col_adjust(curwin->w_cursor.lnum,
+					       (colnr_T)0, 0L, (long)-indent);
+		      }
+		}
 		curwin->w_cursor.lnum--;
 		if (do_join(2, TRUE, FALSE, FALSE) == FAIL)
 		{
diff --git a/src/testdir/test68.in b/src/testdir/test68.in
index e79aed50d..ceaf9af1a 100644
--- a/src/testdir/test68.in
+++ b/src/testdir/test68.in
@@ -61,6 +61,20 @@ ENDTEST
 # 1 a
 }
 
+STARTTEST
+/^{/+3
+:set tw=5 fo=t2a si
+i  A_
+ENDTEST
+
+{
+
+  x a
+  b
+ c
+
+}
+
 STARTTEST
 /^{/+1
 :set tw=5 fo=qn comments=:#
diff --git a/src/testdir/test68.ok b/src/testdir/test68.ok
index 7ec93e635..b3726a0a2 100644
--- a/src/testdir/test68.ok
+++ b/src/testdir/test68.ok
@@ -42,6 +42,15 @@ a b
 }
 
 
+{
+
+  x a
+    b_
+    c
+
+}
+
+
 {
 # 1 a
 #   b
diff --git a/src/version.c b/src/version.c
index 8b6ff662f..c6b464c74 100644
--- a/src/version.c
+++ b/src/version.c
@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    52,
 /**/
     51,
 /**/
-- 
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