Fix missing redraw upon resetting blueprint

[Wumpf]

What

Previously, many parts of the viewer only refresh after moving the cursor. Just clicking the reset button and not moving the mouse left things in an odd state.

Can't screenshot since pressing the screenshot shortcut causes a redraw :)

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[emilk]

egui actually does two repaints for each event (or in other words: repaints until one frame has no new input), so I'm a bit surprised this is needed 🤔 Is there two frames of latency somehow?

[Wumpf]

Hum, that's quite odd then, yes!