Installing Plugin can cause empty drop-down window to be stuck on top of application

[Arecher]

If you install a plugin while one of the drop-down windows is opened, it will completely empty it's entries and stay on top of the application until you close aseprite completely

Reproduction:

1. Select one of the main menu items at the top
2. Borderlessly exit the application window and run an aseprite-extension
3. Use a keyboard key (by default Enter) to accept the dialogs that pop up
4. The drop-down window you kept opened will now be empty, and stay on top of the Aseprite Application until you restart it.

Aseprite and System version

• Aseprite version: Aseprite 1.3.2-x64
• System: Windows 10

[Gasparoken]

Thanks for this report. I was able to reproduce it on Windows and macOS (also it is reproducible on version 1.3.5)