Clarify documentation of wrap-prefix and line-prefix.

 doc/lispref/display.texi (Truncation):
 doc/lispref/text.texi (Special Properties): Describe what a stretch-glyph is
 instead of using that term without explanation.  Make the
 cross-references more accurate.

3 files changed, 26 insertions, 13 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index 72efbee0b5a..37de62be976 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,5 +1,10 @@
 2011-11-26  Eli Zaretskii  <eliz@gnu.org>
 
+	* display.texi (Truncation):
+	* text.texi (Special Properties): Describe what a stretch-glyph is
+	instead of using that term without explanation.  Make the
+	cross-references more accurate.
+
 	* display.texi (Usual Display): Update the description,
 	cross-references, and indexing related to display of control
 	characters and raw bytes.
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 2032ecdc5bc..a9921d7443d 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -193,10 +193,12 @@ a window, that forces truncation.
 @defvar wrap-prefix
 If this buffer-local variable is non-@code{nil}, it defines a
 ``prefix'' that is prepended to every continuation line at
-display-time.  (If lines are truncated, the wrap-prefix is never
-used.)  It may be a string, an image, or a stretch-glyph; the value is
-interpreted in the same way as a @code{display} text property.
-@xref{Display Property}.
+display time.  (If lines are truncated, the wrap-prefix is never
+used.)  It may be a string or an image (@pxref{Other Display Specs}),
+or a stretch of whitespace such as specified by the @code{:width} or
+@code{:align-to} display properties (@pxref{Specified Space}).  The
+value is interpreted in the same way as a @code{display} text
+property.  @xref{Display Property}.
 
 A wrap-prefix may also be specified for regions of text, using the
 @code{wrap-prefix} text or overlay property.  This takes precedence
@@ -206,9 +208,11 @@ over the @code{wrap-prefix} variable.  @xref{Special Properties}.
 @defvar line-prefix
 If this buffer-local variable is non-@code{nil}, it defines a
 ``prefix'' that is prepended to every non-continuation line at
-display-time.  It may be a string, an image, or a stretch-glyph; the
-value is interpreted in the same way as a @code{display} text
-property.  @xref{Display Property}.
+display time.  It may be a string or an image (@pxref{Other Display
+Specs}), or a stretch of whitespace such as specified by the
+@code{:width} or @code{:align-to} display properties (@pxref{Specified
+Space}).  The value is interpreted in the same way as a @code{display}
+text property.  @xref{Display Property}.
 
 A line-prefix may also be specified for regions of text using the
 @code{line-prefix} text or overlay property.  This takes precedence
diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index f320b386445..fc12939bec5 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -3191,10 +3191,12 @@ controls the total height of the display line ending in that newline.
 
 @item wrap-prefix
 If text has a @code{wrap-prefix} property, the prefix it defines will
-be added at display-time to the beginning of every continuation line
+be added at display time to the beginning of every continuation line
 due to text wrapping (so if lines are truncated, the wrap-prefix is
-never used).  It may be a string, an image, or a stretch-glyph such as
-used by the @code{display} text-property.  @xref{Display Property}.
+never used).  It may be a string or an image (@pxref{Other Display
+Specs}), or a stretch of whitespace such as specified by the
+@code{:width} or @code{:align-to} display properties (@pxref{Specified
+Space}).
 
 A wrap-prefix may also be specified for an entire buffer using the
 @code{wrap-prefix} buffer-local variable (however, a
@@ -3203,9 +3205,11 @@ the @code{wrap-prefix} variable).  @xref{Truncation}.
 
 @item line-prefix
 If text has a @code{line-prefix} property, the prefix it defines will
-be added at display-time to the beginning of every non-continuation
-line.  It may be a string, an image, or a stretch-glyph such as used
-by the @code{display} text-property.  @xref{Display Property}.
+be added at display time to the beginning of every non-continuation
+line.  It may be a string or an image (@pxref{Other Display
+Specs}), or a stretch of whitespace such as specified by the
+@code{:width} or @code{:align-to} display properties (@pxref{Specified
+Space}).
 
 A line-prefix may also be specified for an entire buffer using the
 @code{line-prefix} buffer-local variable (however, a