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ShellApp: Use g_signal_connect_object for window signals

Simon McVittie requested to merge smcv/gnome-shell:app-connect-object into master

A window being unmanaged can cause the ShellApp to be removed from the ShellAppSystem, which if we are unlucky is the app's last reference, causing it to be disposed and freed. It would be bad if this happened before we finished handling the signal.

Use g_signal_connect_object to ensure that a reference is held to the ShellApp for the duration of the signal handler, delaying its last-unref.

In particular, when a signal handler calls _shell_app_remove_window(), there is a brief period for which ShellApp breaks the intended invariant (see !497 (closed)) that app->running_state is non-NULL if and only if app->running_state->windows is also non-NULL (non-empty). Freeing the ShellApp at this point would cause a crash. This seems likely to be the root cause of #750 (closed), #822 (closed) and https://bugs.debian.org/926212.

Signed-off-by: Simon McVittie smcv@debian.org

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