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x11: Double check whether the user time window was previously used

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Some applications like Wine may choose to juggle the same user time
window across different toplevels, in that case we receive warnings
when trying to register the window a second time, leading to wrong
accounting.

If the window was already used as the user time window for another
toplevel, unset it from the previous MetaWindow owner, and unregister
so the registration with the new MetaWindow is successful.

https://bugzilla.gnome.org/show_bug.cgi?id=774330
This commit is contained in:
Carlos Garnacho 2016-11-11 20:29:59 +01:00
parent af920851ca
commit ae73e9d84d
1 changed files with 11 additions and 0 deletions
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11
src/x11/window-props.c
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@ -460,6 +460,8 @@ reload_net_wm_user_time_window (MetaWindow *window,
{
if (value->type != META_PROP_VALUE_INVALID)
{
MetaWindow *prev_owner;
/* Unregister old NET_WM_USER_TIME_WINDOW */
if (window->user_time_window != None)
{
@ -472,6 +474,15 @@ reload_net_wm_user_time_window (MetaWindow *window,
NoEventMask);
}
/* Ensure the new user time window is not used on another MetaWindow,
* and unset its user time window if that is the case.
*/
prev_owner = meta_display_lookup_x_window (window->display, value->v.xwindow);
if (prev_owner && prev_owner->user_time_window == value->v.xwindow)
{
meta_display_unregister_x_window (window->display, value->v.xwindow);
prev_owner->user_time_window = None;
}
/* Obtain the new NET_WM_USER_TIME_WINDOW and register it */
window->user_time_window = value->v.xwindow;