Events not registered after continued use

After using the application for a bit, it looks like clicks and some click releases aren't registered. My guess is that maybe some event handling code is too slow, and interferes with registering the next event. That or there is a build up of clutter that slows things down. I thought I fixed some issues with the moderngl garbage collection, but there could still be something there.

Start by reproducing the missing click and click-release events after the application has been used for a while, then inspect the event-handling code and moderngl garbage-collection behavior. Done means clicks and releases continue to register reliably during extended use without accumulating slowdown or clutter.

Written by the indexing model from the issue text.