I dont know how to make repro demo. bug is in CudaText Cocoa build.
- if Find dialog (it is form with ATSynEdit+ATButton controls, inside main form) shown, all ok.
- if Find dialog hides, my toolbar (ATButtonsToolbar) and sidebar (same) don't get OnMouseMove. and toolbar buttons dont hilite when mouse moves over.
Dmitry, can you try to run CudaText cocoa build?