Nah, don't worry, I'll keep maintaining the Mac port. But I'll avoid the upstream gtk-osx project as much as I can, I just hope there won't be any critical bugs to report. I also wanted to have a look at some of the bugs of GTK3 which is still worse than GTK2 for Geany but with this guy around, I'm not motivated to do any work in this respect.
I've just applied this patch:
https://github.com/geany/geany-osx/commit/ce4ac6e76aaba19d79c4412071f2f93f16...
which should fix this particular bug.