Re: Emacs Mac port

[YAMAMOTO Mitsuharu]

>>>>> On Tue, 17 Oct 2017 10:41:11 +0900, YAMAMOTO Mitsuharu <address@hidden> 
>>>>> said:

>> (2) Putting the mouse over a tool-bar button, so that the
>> corresponding tooltip appear, and then quickly dragging the frame
>> with the mouse to another place on the screen, the tooltip is still
>> shown for some time at the original screen position.

> I'll look into it later.

I think I could find the cause of this problem finally.  It took a
long time because it was in the platform-independent part.  I'm still
not sure if the patch below is the right way, but could you check if
this also works for your case?

                                     YAMAMOTO Mitsuharu
                                address@hidden

diff --git a/src/xdisp.c b/src/xdisp.c
index 45eabb10d7..e5e1319e18 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -31029,9 +31029,6 @@ note_mouse_highlight (struct frame *f, int x, int y)
          && part != ON_HEADER_LINE))
     clear_mouse_face (hlinfo);
 
-  /* Reset help_echo_string. It will get recomputed below.  */
-  help_echo_string = Qnil;
-
 #ifdef HAVE_WINDOW_SYSTEM
   /* If the cursor is on the internal border of FRAME and FRAME's
      internal border is draggable, provide some visual feedback.  */
@@ -31090,6 +31087,9 @@ note_mouse_highlight (struct frame *f, int x, int y)
   if (!WINDOWP (window))
     return;
 
+  /* Reset help_echo_string. It will get recomputed below.  */
+  help_echo_string = Qnil;
+
   /* Convert to window-relative pixel coordinates.  */
   w = XWINDOW (window);
   frame_to_window_pixel_xy (w, &x, &y);