Implement monitor change functions on Haiku

* src/haiku_io.c (haiku_len): Handle new event type.
* src/haiku_support.cc (class EmacsScreenChangeMonitor): New
class.
(class Emacs, Emacs): Create new screen change monitor.
(DispatchMessage): Update fullscreen state if the screen
changed.
(SetFullscreen): Don't punt if fullscreen mode is identical.

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

* src/haikuterm.c (haiku_read_socket): Handle new event.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/haiku_io.c b/src/haiku_io.c
index 5d0031ef712..d3455276855 100644
--- a/src/haiku_io.c
+++ b/src/haiku_io.c
@@ -105,6 +105,8 @@ haiku_len (enum haiku_event_type type)
       return sizeof (struct haiku_menu_bar_left_event);
     case SCROLL_BAR_PART_EVENT:
       return sizeof (struct haiku_scroll_bar_part_event);
+    case SCREEN_CHANGED_EVENT:
+      return sizeof (struct haiku_screen_changed_event);
     }
 
   emacs_abort ();