Old bug: Tooltips crash the game if another window opens

[Dwedit]

This is an old bug, even the original version before hacking had it.

So you mouseover a creature with summoning sickness. It makes a "Summoning Sickness" tooltip appear.
The AI plays something. A second window appears.
The game becomes completely unresponsive as long as the tooltip is on the screen. Sometimes you can get away with it (because certain prompts have an expiration time before they close), but other times the game is as good as crashed.

I wonder if it's possible to NOP out the code responsible for creating tooltips?