* Lazarus Version: today's Git * Operating System: Ubuntu 20.4 * CPU / Bitness: x64 ## What happens Demo: [tst-splitter.zip](/uploads/f7253707f3bb9bb6953a46a93e6c0a30/tst-splitter.zip) On dragging the splitter by mouse, any focused TMemo looses the focus. Bug: gtk2 and Qt5. Win32 works good. ## What did you expect Dragging of splitter must not affect the focusing of other controls. I tested it in DoubleCommander Linux-x64 made with Lazarus 2.2.6 - there, it works correctly. ## Notes I added the line `ControlStyle := ControlStyle + [csNoFocus];` to the TCustomSplitter.Create. Did not help.