master 3d2531c12c: Fix generation of extra DND events while dragging on Haiku

[Po Lu]

branch: master
commit 3d2531c12c54f9ab923603655016077450c23ab2
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix generation of extra DND events while dragging on Haiku
    
    * src/haiku_support.cc (be_drag_message): Set new DND flag.
    (be_drag_and_drop_in_progress): New function.
    * src/haiku_support.h: Update prototypes.
    * src/haikuterm.c (haiku_read_socket): Don't store DND motion
    events if DND is in progress.
---
 src/haiku_support.cc | 19 +++++++++++++++++--
 src/haiku_support.h  |  3 +++
 src/haikuterm.c      | 14 +++++++++-----
 3 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/src/haiku_support.cc b/src/haiku_support.cc
index 64556ba51b..40112e2b71 100644
--- a/src/haiku_support.cc
+++ b/src/haiku_support.cc
@@ -122,6 +122,7 @@ static int current_window_id;
 
 static void *grab_view = NULL;
 static BLocker grab_view_locker;
+static bool drag_and_drop_in_progress;
 
 /* This could be a private API, but it's used by (at least) the Qt
    port, so it's probably here to stay.  */
@@ -4111,6 +4112,8 @@ be_drag_message (void *view, void *message, bool 
allow_same_view,
   resume_thread (infos[1].object);
   unblock_input_function ();
 
+  drag_and_drop_in_progress = true;
+
   while (true)
     {
       block_input_function ();
@@ -4128,12 +4131,24 @@ be_drag_message (void *view, void *message, bool 
allow_same_view,
        process_pending_signals_function ();
 
       if (should_quit_function ())
-       return true;
+       {
+         drag_and_drop_in_progress = false;
+         return true;
+       }
 
       if (infos[1].events & B_EVENT_INVALID)
-       return false;
+       {
+         drag_and_drop_in_progress = false;
+         return false;
+       }
 
       infos[0].events = B_EVENT_READ;
       infos[1].events = B_EVENT_INVALID;
     }
 }
+
+bool
+be_drag_and_drop_in_progress (void)
+{
+  return drag_and_drop_in_progress;
+}
diff --git a/src/haiku_support.h b/src/haiku_support.h
index ac3029fbf3..d0a78c693b 100644
--- a/src/haiku_support.h
+++ b/src/haiku_support.h
@@ -951,6 +951,9 @@ extern "C"
                   void (*process_pending_signals_function) (void),
                   bool (*should_quit_function) (void));
 
+  extern bool
+  be_drag_and_drop_in_progress (void);
+
 #ifdef __cplusplus
   extern void *
   find_appropriate_view_for_draw (void *vw);
diff --git a/src/haikuterm.c b/src/haikuterm.c
index 91e985e196..e2d6a9a467 100644
--- a/src/haikuterm.c
+++ b/src/haikuterm.c
@@ -3145,12 +3145,16 @@ haiku_read_socket (struct terminal *terminal, struct 
input_event *hold_quit)
                       another program is dragging stuff over us.  */
 
                    do_help = -1;
-                   inev.kind = DRAG_N_DROP_EVENT;
-                   inev.arg = Qlambda;
 
-                   XSETINT (inev.x, b->x);
-                   XSETINT (inev.y, b->y);
-                   XSETFRAME (inev.frame_or_window, f);
+                   if (!be_drag_and_drop_in_progress ())
+                     {
+                       inev.kind = DRAG_N_DROP_EVENT;
+                       inev.arg = Qlambda;
+
+                       XSETINT (inev.x, b->x);
+                       XSETINT (inev.y, b->y);
+                       XSETFRAME (inev.frame_or_window, f);
+                     }
                    break;
                  }
              }