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window: Emit an error and return when trying to activate an unmanaged

Marco Trevisan requested to merge 3v1n0/mutter:window-guard-against-unmanaged into master

As per followup of this discussion: !562 (comment 502846)

If something (i.e. gnome-shell or an extension) tries to activate an unmanaged window, we should warn about this and avoid to perform further actions as this could lead to a crash of mutter, since the window has not valid flags (like workspace) set anymore at this stage.

Fixes #580 (closed)

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