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window: Force update monitor on hot plugs

Browse Source 
Commit a3da4b8d5b changed updating of
window monitors to always use take affect when it was done from a
non-user operation. This could cause feed back loops when a non-user
driven operation would trigger the changing of a monitor, which itself
would trigger changing of the monitor again due to a window scale
change.

The reason for the change, was that when the window monitor changed due
to a hot plug, if it didn't actually change, eventually the window
monitor pointer would be pointing to freed memory.

Instead of force updating the monitor on all non-user operations, just
do it on hot plugs. This allows for the feedback loop preventing logic
to still do what its supposed to do, without risking dangling pointers
on hot plugs.

Related: https://gitlab.gnome.org/GNOME/mutter/issues/189
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/192

(cherry picked from commit 8d3e053059)
This commit is contained in:
Jonas Ådahl 2018-08-24 12:56:31 +02:00 committed by Marco Trevisan (Treviño)
parent 30266605b5
commit 83b7b17b64
3 changed files with 4 additions and 3 deletions
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1
src/core/window-private.h
View File

@ -125,6 +125,7 @@ typedef enum _MetaWindowUpdateMonitorFlags
{
META_WINDOW_UPDATE_MONITOR_FLAGS_NONE = 0,
META_WINDOW_UPDATE_MONITOR_FLAGS_USER_OP = 1 << 0,
META_WINDOW_UPDATE_MONITOR_FLAGS_FORCE = 1 << 1,
} MetaWindowUpdateMonitorFlags;
typedef struct _MetaPlacementRule

4
src/core/window.c
View File

@ -3805,7 +3805,7 @@ meta_window_update_for_monitors_changed (MetaWindow *window)
if (window->override_redirect || window->type == META_WINDOW_DESKTOP)
{
meta_window_update_monitor (window,
META_WINDOW_UPDATE_MONITOR_FLAGS_NONE);
META_WINDOW_UPDATE_MONITOR_FLAGS_FORCE);
return;
}
@ -3841,7 +3841,7 @@ meta_window_update_for_monitors_changed (MetaWindow *window)
else
{
meta_window_update_monitor (window,
META_WINDOW_UPDATE_MONITOR_FLAGS_NONE);
META_WINDOW_UPDATE_MONITOR_FLAGS_FORCE);
}
}

2
src/wayland/meta-window-wayland.c
View File

@ -413,7 +413,7 @@ meta_window_wayland_update_main_monitor (MetaWindow *window,
return;
}
if (flags & META_WINDOW_UPDATE_MONITOR_FLAGS_USER_OP)
if (flags & META_WINDOW_UPDATE_MONITOR_FLAGS_FORCE)
{
window->monitor = to;
return;