Port `x-lost-selection-functions' to Haiku

* src/haiku_io.c (haiku_len): Add `CLIPBOARD_CHANGED_EVENT'.
* src/haiku_select.cc (be_update_clipboard_count): Set ownership
flags.
(be_handle_clipboard_changed_message):
(be_start_watching_selection): New functions.

* src/haiku_support.cc (class Emacs): Handle
B_CLIPBOARD_CHANGED.

* src/haiku_support.h (enum haiku_event_type): New event
`CLIPBOARD_CHANGED_EVENT'.
(struct haiku_clipboard_changed_event): New struct.

* src/haikuselect.c (haiku_handle_selection_clear)
(haiku_selection_disowned, haiku_start_watching_selections): New
functions.
(syms_of_haikuselect): New defsym and defvar.

* src/haikuselect.h: Update prototypes.
* src/haikuterm.c (haiku_read_socket): Handle selection events.
(haiku_term_init): Start watching selections.
* src/haikuterm.h: Update prototypes.
* src/keyboard.c (kbd_buffer_get_event, process_special_events)
(mark_kboards): Handle SELECTON_CLEAR_EVENTs correctly on Haiku.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/haiku_support.h b/src/haiku_support.h
index 6260b35cbc1..d73f15560be 100644
--- a/src/haiku_support.h
+++ b/src/haiku_support.h
@@ -114,8 +114,14 @@ enum haiku_event_type
     DUMMY_EVENT,
     SCREEN_CHANGED_EVENT,
     MENU_BAR_LEFT,
+    CLIPBOARD_CHANGED_EVENT,
   };
 
+struct haiku_clipboard_changed_event
+{
+  char dummy;
+};
+
 struct haiku_screen_changed_event
 {
   bigtime_t when;