Support MS-Windows build and reversed rows in GUI frames; add initial docs.

 doc/emacs/mule.texi (International): Mention support of
 bidirectional editing.
 (Bidirectional Editing): New section.
 etc/HELLO: Reorder Arabic and Hebrew into logical order, and
 insert RLM before the opening paren, to make the display more
 reasonable.  Add setting for bidi-display-reordering in the local
 variables section.
 lisp/files.el: Make bidi-display-reordering safe variable for
 boolean values.
 src/xdisp (append_glyph): If the glyph row is reversed, prepend the
 glyph rather than appending it.
 src/makefile.w32-in (OBJ1): Add $(BLD)/bidi.$(O).
 ($(BLD)/bidi.$(O)): New target.

3 files changed, 47 insertions, 2 deletions

diff --git a/src/ChangeLog.bidi b/src/ChangeLog.bidi
index d27f747466b..33982c21450 100644
--- a/src/ChangeLog.bidi
+++ b/src/ChangeLog.bidi
@@ -1,5 +1,25 @@
+2010-03-29  Eli Zaretskii  <eliz@gnu.org>
+
+        * doc/emacs/mule.texi (International): Mention support of
+        bidirectional editing.
+        (Bidirectional Editing): New section.
+
 2010-03-28  Eli Zaretskii  <eliz@gnu.org>
 
+        * etc/HELLO: Reorder Arabic and Hebrew into logical order, and
+        insert RLM before the opening paren, to make the display more
+        reasonable.  Add setting for bidi-display-reordering in the local
+        variables section.
+
+        * lisp/files.el: Make bidi-display-reordering safe variable for
+        boolean values.
+
+        * xdisp (append_glyph): If the glyph row is reversed, prepend the
+        glyph rather than appending it.
+
+        * makefile.w32-in (OBJ1): Add $(BLD)/bidi.$(O).
+        ($(BLD)/bidi.$(O)): New target.
+
         * bidi.c (bidi_get_next_char_visually): Improve commentary.
 
         * dispextern.h (PRODUCE_GLYPHS): Set the reversed_p flag in the
diff --git a/src/makefile.w32-in b/src/makefile.w32-in
index 156eddd6092..edb3f3f711b 100644
--- a/src/makefile.w32-in
+++ b/src/makefile.w32-in
@@ -115,6 +115,7 @@ OBJ1 =  $(BLD)/alloc.$(O)		\
         $(BLD)/vm-limit.$(O)            \
         $(BLD)/region-cache.$(O)        \
         $(BLD)/strftime.$(O)            \
+        $(BLD)/bidi.$(O)                \
         $(BLD)/charset.$(O)             \
         $(BLD)/character.$(O)           \
         $(BLD)/chartab.$(O)             \
@@ -338,6 +339,14 @@ $(BLD)/atimer.$(O) : \
         $(SRC)/syssignal.h \
         $(SRC)/systime.h
 
+$(BLD)/bidi.$(O) : \
+        $(SRC)/bidi.c \
+        $(CONFIG_H) \
+        $(SRC)/lisp.h \
+        $(SRC)/buffer.h \
+        $(SRC)/character.h \
+        $(SRC)/dispextern.h
+
 $(BLD)/buffer.$(O) : \
         $(SRC)/buffer.c \
         $(CONFIG_H) \
diff --git a/src/xdisp.c b/src/xdisp.c
index 867018180aa..ed2db08905d 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -17823,8 +17823,8 @@ display_line (it)
   ++it->vpos;
   ++it->glyph_row;
   /* The next row should use same value of the reversed_p flag as this
-     one.  set_iterator_to_next decides when it's a new paragraph and
-     recomputes the value of the flag accordingly.  */
+     one.  set_iterator_to_next decides when it's a new paragraph, and
+     PRODUCE_GLYPHS recomputes the value of the flag accordingly.  */
   it->glyph_row->reversed_p = row->reversed_p;
   it->start = row_end;
   return row->displays_text_p;
@@ -21355,6 +21355,17 @@ append_glyph (it)
   glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
   if (glyph < it->glyph_row->glyphs[area + 1])
     {
+      /* If the glyph row is reversed, we need to prepend the glyph
+         rather than append it.  */
+      if (it->glyph_row->reversed_p && area == TEXT_AREA)
+        {
+          struct glyph *g;
+
+          /* Make room for the additional glyph.  */
+          for (g = glyph - 1; g >= it->glyph_row->glyphs[area]; g--)
+            g[1] = *g;
+          glyph = it->glyph_row->glyphs[area];
+        }
       glyph->charpos = CHARPOS (it->position);
       glyph->object = it->object;
       if (it->pixel_width > 0)
@@ -21391,6 +21402,11 @@ append_glyph (it)
             abort ();
           glyph->bidi_type = it->bidi_it.type;
         }
+      else
+        {
+          glyph->resolved_level = 0;
+          glyph->bidi_type = UNKNOWN_BT;
+        }
       ++it->glyph_row->used[area];
     }
   else