ee88a685f8
Previously, we triggered a layout (and hence a repaint) when sliding the draw because we gave the draw loose constraints. The drawer uses an Align to move itself to the proper side of the screen, so it can have tight constraints, which makes it a layout boundary. Also, don't trigger a layout just because the Scaffold rebuilds. There isn't any state in the scaffold custom layout, so it doesn't need to repaint just because we created a new instance of the delegate. Finally, add the debugging infrastructure I used to find these issues.
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