http://bugs.winehq.org/show_bug.cgi?id=58648
--- Comment #2 from Miliardo agarplayerarlon@gmail.com --- (In reply to alexandros.frantzis from comment #1)
I recall that in the past I had seen such flicker with winewayland, and the root cause was that regedit in particular was quite slow to redraw and due to the way winewayland handles events, this slowness triggered some internal timeouts and window content flushes in Wine core.
However, this time around I can reproduce the flickering with winex11 too (XWayland under KDE), so something is different in core. Can you please check if you also get the flickering when resizing regedit with winex11?
I can reproduce the flickering on Regedit with Winex11 too on KDE Wayland with xWayland