(w32_wnd_proc) <WM_MOUSEMOVE>: Ignore mouse movements if a menu is active

on this frame.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/w32fns.c b/src/w32fns.c
index 1cc3dc2800c..093739d1603 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -3297,6 +3297,14 @@ w32_wnd_proc (hwnd, msg, wParam, lParam)
       return (msg == WM_XBUTTONDOWN || msg == WM_XBUTTONUP);
 
     case WM_MOUSEMOVE:
+      /* Ignore mouse movements as long as the menu is active.  These
+	 movements are processed by the window manager anyway, and
+	 it's wrong to handle them as if they happened on the
+	 underlying frame.  */
+      f = x_window_to_frame (dpyinfo, hwnd);
+      if (f && f->output_data.w32->menubar_active)
+	return 0;
+
       /* If the mouse has just moved into the frame, start tracking
 	 it, so we will be notified when it leaves the frame.  Mouse
 	 tracking only works under W98 and NT4 and later. On earlier