Force render update after user key input

I have a visualization.gui-based app, displaying a pointcloud in a SceneWidget. There is a key event callback registered so the user can manipulate the pointcloud, e.g. rotate by 90. The callback performs the requested action and does a remove_geometry()/add_geometry() on the pointcloud. All of that works fine.

The problem is that the SceneWidget does not update/re-render consistently: it seems to require some mouse motion to trigger display of the new state. The mouse on my desktop is sensitive enough that it generates enough small random motion to work about 80% of the time. With the laptop, not so much: it almost always fails to update until I wipe a finger across the touchpad.

I've tried all combinations of HANDLED/CONSUMED on the key event, plus force_update() on both the SceneWidget and the main window...no joy. Am I missing something obvious?

(Windows 11 Pro, open3d 0.19.0, Python 3.1, if it matters.)

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