Invoking each view gradually increases the processing overhead

[fossfreedom]

every view connects to coverart_album signals when initialised.

Each view initialised event is being called when first toggled by the user.

Thus, for example, multiple views will respond to an album-update or visual-updated signal.

Think that just as a view does stuff with "switched-to" by the user, it should similarly have a "switched-from" implementation which would disconnect itself from various signals.

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