[0.25] Clicking through filter buttons on Map

[JWag]

In Franklin's .25 Changelog thread, one of the new changes was:

* MapView Filtering state is now persistent.

This made me very happy. However, I noticed that sometimes the filter buttons don't respond, the clicks just go through them to whatever is behind. I first noticed it on the launch pad waiting to launch to rescue a stranded Kerbal in orbit. I went to de-clutter with the filters and they didn't work.

Unfortunately, I didn't get a log from one of the incidents, and now I have added mods to the game. I'll try to remember to create an unmodded copy of the game and see if I can reproduce.