7133fac91f
When the screencast fails to start, we currently don't really inform the user, other than the red screencasting indicator in the panel going away. Re-use the failure handling paths to also show a notification when the screencast fails to start. The notification in this case obviously should not have an action to open a file (there is no file), so make that depend on whether this._screencastPath is set and unset the path. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2976>