Handle `(space ...)' display spec as paragraph separator.

 src/xdisp.c (compute_display_string_pos): Return 2 in DISP_PROP when
 the display spec is of the form `(space ...)'.
 (handle_display_spec): Return the value returned by
 handle_single_display_spec, not just 1 or zero.
 (handle_single_display_spec): If the display spec is of the form
 `(space ...)', and specifies display in the text area, return 2
 rather than 1.
 src/dispextern.h (struct bidi_it): Rename the disp_prop_p member
 into disp_prop; all users changed.
 src/bidi.c (bidi_fetch_char): If compute_display_string_pos returns
 DISP_PROP = 2, substitute the u+2029 PARAGRAPH SEPARATOR character
 for the text covered by the display property.
 lisp/buff-menu.el (Buffer-menu-buffer+size): Remove calls to
 bidi-string-mark-left-to-right; they are unnecessary now.
 doc/lispref/display.texi (Specified Space): Mention that `space' specs
 influence bidi reordering.
 (Bidirectional Display): Explain how to use `(space . PROPS)' for
 separating fields with bidirectional content.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 084a3f9e07f..f5d20250fa7 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1860,8 +1860,9 @@ struct bidi_it {
   bidi_dir_t sor;               /* direction of start-of-run in effect */
   int scan_dir;                 /* direction of text scan, 1: forw, -1: back */
   EMACS_INT disp_pos;           /* position of display string after ch */
-  int disp_prop_p;              /* if non-zero, there really is a
-                                   `display' property/string at disp_pos */
+  int disp_prop;                /* if non-zero, there really is a
+                                   `display' property/string at disp_pos;
+                                   if 2, the property is a `space' spec */
   int stack_idx;                /* index of current data on the stack */
   /* Note: Everything from here on is not copied/saved when the bidi
      iterator state is saved, pushed, or popped.  So only put here