Fix flickering in the project pane.
This isn't a nice fix but the least evil version of a hack i could come up. The source of the flickering is: We have a deeply nested structure of widgets on the project pane. If we call hide() on such a deeply nested widget, it will activate() it's parent layout synchronously. That will then post an event (via updateGeometries() ) to its parent layout that it needs relayouting. Which then will post to its parent layout the same. And for each LayoutRequested, there's a painting in between. The fix instead calls activate() up the chain until we are at the viewport. This immediately relayouts everything. This adds a non obvoius potentially for breakeage if the widgets are embedded in a different widget hierarchy. But well, that's life.
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