Olivier Fourdan
68ec9ac017
wayland: No xdg-output events without a logical monitor ...
To avoid a known race condition in the wl_output protocol documented in
https://phabricator.freedesktop.org/T7722 , mutter delays the `wl_output`
destruction but nullify the `logical_monitor` associated with the
`wl_output` and the binding routine `bind_output()` makes sure not to
send wl_output events if the `logical_monitor` is `NULL` (see commit
1923db97).
The binding routine for `xdg_output` however does not check for such a
condition, hence if the output configuration changes while a client is
binding to xdg-output (typically Xwayland at startup), mutter would
crash while trying to access the `logical_monitor` which was nullified
by the change in configuration.
Just like `bind_output()` does for wl_output, do not send xdg-output
events if there is no `logical_monitor` yet.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/194
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68ec9ac017