[Builder] On-mouse-focus reloading of "Select Window" drop-down menu - annoying behavior

[Mr-Dispatch]

The reloading after mouse focus causes multiple resizes as the control is first emptied, and then the items are re-added. If the mouse is sufficiently to the right side of the control, this might trigger further updates as the control loses/gains focus by shrinking/growing. Even without the oscillation, it looks weird / off-putting on its own.

Possible fixes

• one big update
• locking the size (or even giving it a minimum size) during the update
• ?reload on drop-down event?
• ?batch the small updates?
• disabling the event-handler until reload is done -- doesn't help with the "flicker", though

[rabbibotton]

Really appreciate the reports. I will get to them as soon as can. Please feel free to send any other comments and bugs, it is helpful to me.