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core: Avoid grab transfer shenanigans with non-X11 backend

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This explicit ungrab is made to ensure the other X11 display connection
is able to start an active grab immediately on the device without receiving
AlreadyGrabbed.

This is just relevant if there's two X11 display connections to transfer
grabs across, which may just happen on X11 windowing.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/420
This commit is contained in:
Carlos Garnacho 2018-12-30 13:15:36 +01:00 committed by Jonas Ådahl
parent ef074ea510
commit 103c469cc9
1 changed files with 11 additions and 8 deletions
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19
src/core/display.c
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@ -1677,14 +1677,17 @@ meta_display_begin_grab_op (MetaDisplay *display,
if (pointer_already_grabbed)
display->grab_have_pointer = TRUE;
/* Since grab operations often happen as a result of implicit
* pointer operations on the display X11 connection, we need
* to ungrab here to ensure that the backend's X11 can take
* the device grab. */
XIUngrabDevice (display->x11_display->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
timestamp);
XSync (display->x11_display->xdisplay, False);
if (META_IS_BACKEND_X11 (meta_get_backend ()) && display->x11_display)
{
/* Since grab operations often happen as a result of implicit
* pointer operations on the display X11 connection, we need
* to ungrab here to ensure that the backend's X11 can take
* the device grab. */
XIUngrabDevice (display->x11_display->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
timestamp);
XSync (display->x11_display->xdisplay, False);
}
if (meta_backend_grab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp))
display->grab_have_pointer = TRUE;