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contraints: Do not constrain modals without parent

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xdg-foreign clears the `transient_for` of a modal dialog when its
imported parent is destroyed, which would later cause a crash in
`constrain_modal_dialog()` because the transient `NULL`.

So in case a modal dialog has no parent, do not try to constrain it
against its parent.

Closes: https://gitlab.gnome.org/GNOME/mutter/issues/174
(cherry picked from commit 912a6f5e3f)
This commit is contained in:
Olivier Fourdan 2018-07-08 16:23:25 +02:00
parent fe1616668e
commit 3288edf677
1 changed files with 2 additions and 1 deletions
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3
src/core/constraints.c
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@ -886,7 +886,8 @@ constrain_modal_dialog (MetaWindow *window,
MetaRectangle child_rect, parent_rect;
gboolean constraint_already_satisfied;
if (!meta_window_is_attached_dialog (window) ||
if (!parent ||
!meta_window_is_attached_dialog (window) ||
meta_window_get_placement_rule (window))
return TRUE;