Implement cursor on the left fringe for R2L lines.

 xdisp.c (IT_OVERFLOW_NEWLINE_INTO_FRINGE): For R2L lines,
 consider the left fringe, not the right one.
 (set_cursor_from_row): Don't reverse pos_before and pos_after for
 reversed glyph rows.  Set cursor.x to negative value when the
 cursor might be on the left fringe.
 (extend_face_to_end_of_line): Append the stretch glyph only if its
 width is positive.
 (notice_overwritten_cursor, draw_phys_cursor_glyph)
 (erase_phys_cursor): For reversed cursor_row, support cursor on
 the left fringe.
 w32term.c (w32_draw_window_cursor): For reversed glyph rows,
 draw cursor on the left fringe.
 xterm.c (x_draw_window_cursor): For reversed glyph rows, draw
 cursor on the left fringe.
 fringe.c (draw_fringe_bitmap): For reversed glyph rows, allow
 cursor on the left fringe.
 dispnew.c (update_text_area): Handle reversed desired rows when
 the cursor is on the left fringe.
 (set_window_cursor_after_update): Limit cursor's hpos by -1 from
 below, not by 0, for when the cursor is on the left fringe.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 268a245caf3..e6faa0a4c9e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -2,6 +2,31 @@
 
         Implement display of R2L paragraphs in GUI sessions.
 
+        * xdisp.c (IT_OVERFLOW_NEWLINE_INTO_FRINGE): For R2L lines,
+        consider the left fringe, not the right one.
+        (set_cursor_from_row): Don't reverse pos_before and pos_after for
+        reversed glyph rows.  Set cursor.x to negative value when the
+        cursor might be on the left fringe.
+        (extend_face_to_end_of_line): Append the stretch glyph only if its
+        width is positive.
+        (notice_overwritten_cursor, draw_phys_cursor_glyph)
+        (erase_phys_cursor): For reversed cursor_row, support cursor on
+        the left fringe.
+
+        * w32term.c (w32_draw_window_cursor): For reversed glyph rows,
+        draw cursor on the left fringe.
+
+        * xterm.c (x_draw_window_cursor): For reversed glyph rows, draw
+        cursor on the left fringe.
+
+        * fringe.c (draw_fringe_bitmap): For reversed glyph rows, allow
+        cursor on the left fringe.
+
+        * dispnew.c (update_text_area): Handle reversed desired rows when
+        the cursor is on the left fringe.
+        (set_window_cursor_after_update): Limit cursor's hpos by -1 from
+        below, not by 0, for when the cursor is on the left fringe.
+
         * xdisp.c [HAVE_WINDOW_SYSTEM]: Add prototype for
         append_stretch_glyph.
         (set_cursor_from_row) <cursor_x>: Remove unused variable.  Fix