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contraints: Do not constrain modals without parent
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
)
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@ -886,7 +886,8 @@ constrain_modal_dialog (MetaWindow *window,
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MetaRectangle child_rect, parent_rect;
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MetaRectangle child_rect, parent_rect;
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gboolean constraint_already_satisfied;
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gboolean constraint_already_satisfied;
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if (!meta_window_is_attached_dialog (window) ||
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if (!parent ||
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!meta_window_is_attached_dialog (window) ||
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meta_window_get_placement_rule (window))
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meta_window_get_placement_rule (window))
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return TRUE;
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return TRUE;
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