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, 4 insertions, 2 deletions

diff --git a/src/w32term.c b/src/w32term.c
index 7222e26efd2..0b71b7e02b7 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -5136,10 +5136,12 @@ w32_draw_window_cursor (w, glyph_row, x, y, cursor_type, cursor_width, on_p, act
         }
 
       if (glyph_row->exact_window_width_line_p
-          && w->phys_cursor.hpos >= glyph_row->used[TEXT_AREA])
+          && (glyph_row->reversed_p
+              ? (w->phys_cursor.hpos < 0)
+              : (w->phys_cursor.hpos >= glyph_row->used[TEXT_AREA])))
         {
           glyph_row->cursor_in_fringe_p = 1;
-          draw_fringe_bitmap (w, glyph_row, 0);
+          draw_fringe_bitmap (w, glyph_row, glyph_row->reversed_p);
           return;
         }