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core: Check X11 display availability before use in MetaStackTracker

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This object can be generally triggered without a X11 display, so make sure
this is alright. For guard window checks, use our internal
meta_stack_tracker_is_guard_window() call, which is already no-x11 aware.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/730
This commit is contained in:
Carlos Garnacho 2019-08-16 00:27:03 +02:00 committed by Jonas Ådahl
parent 433e1b388d
commit 78232fa3eb
1 changed files with 6 additions and 4 deletions
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10
src/core/stack-tracker.c
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@ -924,8 +924,10 @@ meta_stack_tracker_sync_stack (MetaStackTracker *tracker)
if (META_STACK_ID_IS_X11 (window))
{
MetaX11Display *x11_display = tracker->display->x11_display;
MetaWindow *meta_window =
meta_x11_display_lookup_x_window (x11_display, (Window)window);
MetaWindow *meta_window = NULL;
if (x11_display)
meta_window = meta_x11_display_lookup_x_window (x11_display, (Window) window);
/* When mapping back from xwindow to MetaWindow we have to be a bit careful;
* children of the root could include unmapped windows created by toolkits
@ -1183,7 +1185,7 @@ meta_stack_tracker_restack_managed (MetaStackTracker *tracker,
{
MetaWindow *old_window = meta_display_lookup_stack_id (tracker->display, windows[old_pos]);
if ((old_window && !old_window->override_redirect && !old_window->unmanaging) ||
windows[old_pos] == tracker->display->x11_display->guard_window)
meta_stack_tracker_is_guard_window (tracker, windows[old_pos]))
break;
}
g_assert (old_pos >= 0);
@ -1202,7 +1204,7 @@ meta_stack_tracker_restack_managed (MetaStackTracker *tracker,
while (old_pos >= 0 && new_pos >= 0)
{
if (windows[old_pos] == tracker->display->x11_display->guard_window)
if (meta_stack_tracker_is_guard_window (tracker, windows[old_pos]))
break;
if (windows[old_pos] == managed[new_pos])