Filter apps which shouldn't activate focus_follows_mouse: autofocus

I have keyboard shortcuts for Spotlight and Launchpad. When they activate on the second screen (the one I don't have my cursor on) and I try to move the mouse to control them, they close. Is there a way for me to filter which apps should activate focus_follows_mouse? Or is this a wider issue regarding these builtin apps (mainly concerning Launchpad)?

Start by reproducing the behavior with Spotlight and Launchpad on a second screen while focus_follows_mouse is enabled. Investigate how focus_follows_mouse handles these built-in apps and whether app-specific filtering is possible; done means the affected apps no longer close when the pointer reaches them, without breaking normal focus behavior.

Written by the indexing model from the issue text.