Implement dead key combination on Android

* src/android.c (android_init_key_character_map)
(android_get_dead_char): New functions.
(android_wc_lookup_string): New argument COMPOSE_STATE.  Ignore
key events with the COMBINING_ACCENT flag set while recording
their character values there, and combine such characters with
the key event when processing a subsequent key event.

* src/androidgui.h (struct android_compose_status): New
structure.

* src/androidterm.c (handle_one_android_event): Port dead key
combination code from X.  (bug#69321)

1 files changed, 11 insertions, 1 deletions

diff --git a/src/androidgui.h b/src/androidgui.h
index 89317581191..73b60c483d3 100644
--- a/src/androidgui.h
+++ b/src/androidgui.h
@@ -612,6 +612,15 @@ struct android_window_changes
   enum android_stack_mode stack_mode;
 };
 
+struct android_compose_status
+{
+  /* Accent character to be combined with another.  */
+  unsigned int accent;
+
+  /* Number of characters matched.  */
+  int chars_matched;
+};
+
 extern int android_pending (void);
 extern void android_next_event (union android_event *);
 extern bool android_check_if_event (union android_event *,
@@ -707,7 +716,8 @@ extern void android_translate_coordinates (android_window, int,
                                            int, int *, int *);
 extern int android_wc_lookup_string (android_key_pressed_event *,
                                      wchar_t *, int, int *,
-                                     enum android_lookup_status *);
+                                     enum android_lookup_status *,
+                                     struct android_compose_status *);
 extern void android_recreate_activity (android_window);
 extern void android_update_ic (android_window, ptrdiff_t, ptrdiff_t,
                                ptrdiff_t, ptrdiff_t);