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window/wayland: Always update monitor for non-user ops

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meta_window_wayland_update_main_monitor() would skip the monitor update
if the difference in scale between the old and the new monitor would
cause another monitor change.

While this is suitable when the monitor change results from a user
interactively moving the surface between monitors of different scales,
this can leave dangling pointers to freed monitors when this is
triggered by a change of monitor configuration.

Make sure we update the monitor unconditionally if not from a user
operation.

Closes: https://gitlab.gnome.org/GNOME/mutter/issues/189

(cherry picked from commit a3da4b8d5b)
This commit is contained in:
Olivier Fourdan 2018-06-18 10:39:11 +00:00 committed by Ray Strode
parent 63c33c5bb2
commit e8a09942e9
1 changed files with 6 additions and 0 deletions
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6
src/wayland/meta-window-wayland.c
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@ -413,6 +413,12 @@ meta_window_wayland_update_main_monitor (MetaWindow *window,
return;
}
if (!user_op)
{
window->monitor = to;
return;
}
from_scale = meta_logical_monitor_get_scale (from);
to_scale = meta_logical_monitor_get_scale (to);