Looking great so far, any chance you can add like a hover hint. So if you hover over something it explains what it does? For example I have no idea what the "Invert Weld's" Tick box does.
I thought that might be a bit confusing. What that does is change it from a blacklist to a whitelist. So instead of adding people to restrict it, you're adding people to allow them. The invert tools would do the same, but for ALL tools. If both are enabled, then the specific tool becomes a blacklist again while all other tools are still a whitelist. Hope that's understandable... I will definitely add some kind of explanation some where.
EDIT: Since I have a hard time finding Stickly online at a good time, I'm just going to ask here and hope you see this
. I was curious if there is any way that you can queue up function calls in with xlib's animations? So it would run an animation, run a function, then run an animation again? Without spending a lot of time looking through your code, it's hard to figure this out with a glance around.