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GDK W32: Refuse to release mouse grab while in DnD mode

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Handle WM_CANCELMODE and do nothing in response to it when DnD is
active. Otherwise pass it to DefWindowProc, which will call ReleaseCapture()
on our behalf.
This prevents us from losing mouse capture when alt-tabbing during DnD
(this includes the feature of Windows Explorer where dragging stuff over
a window button in the taskbar causes that window to receive focus, i.e.
keyboardless alt-tabbing).

https://bugzilla.gnome.org/show_bug.cgi?id=786509
This commit is contained in:
Руслан Ижбулатов 2017-09-14 17:43:38 +00:00
parent 6d37ed6256
commit a66017a6a0
1 changed files with 17 additions and 0 deletions
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17
gdk/win32/gdkevents-win32.c
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@ -3281,6 +3281,23 @@ gdk_event_translate (MSG *msg,
break;
/*
* Handle WM_CANCELMODE and do nothing in response to it when DnD is
* active. Otherwise pass it to DefWindowProc, which will call ReleaseCapture()
* on our behalf.
* This prevents us from losing mouse capture when alt-tabbing during DnD
* (this includes the feature of Windows Explorer where dragging stuff over
* a window button in the taskbar causes that window to receive focus, i.e.
* keyboardless alt-tabbing).
*/
case WM_CANCELMODE:
if (_modal_operation_in_progress & GDK_WIN32_MODAL_OP_DND)
{
return_val = TRUE;
*ret_valp = 0;
}
break;
case WM_CAPTURECHANGED:
/* Sometimes we don't get WM_EXITSIZEMOVE, for instance when you
select move/size in the menu and then click somewhere without