Continue working on handling of properties in bidi iteration.

Region display and extension seems to work.
Solved a crash in bidirectional display of etc/HELLO.
(HELLO display still not 100% OK, e.g. near Kannada.)

 .gdbinit (pitx): Display some bidi information about the
 iterator.

 dispextern.h (BIDI_AT_BASE_LEVEL): Enclose definition in
 parentheses.

 xdisp.c (handle_stop_backwards): Save and restore it->current
 and it->position, instead of expecting the caller to do that.
 (next_element_from_buffer): When moving across stop_charpos,
 record it in prev_stop.  When IT_CHARPOS backs up, call
 handle_stop_backwards only if above the base embedding level.
 This solves the crash while displaying etc/HELLO in bidi mode.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/.gdbinit b/src/.gdbinit
index a500f2532f..8949e66134 100644
--- a/src/.gdbinit
+++ b/src/.gdbinit
@@ -271,6 +271,9 @@ define pitx
     end
   end
   printf "\n"
+  if ($it->bidi_p)
+    printf "BIDI: base_stop=%d prev_stop=%d level=%d\n", $it->base_level_stop, $it->prev_stop, $it->bidi_it.resolved_level
+  end
   if ($it->region_beg_charpos >= 0)
     printf "reg=%d-%d ", $it->region_beg_charpos, $it->region_end_charpos
   end