https://bugs.winehq.org/show_bug.cgi?id=54269
--- Comment #5 from Rafał Mużyło galtgendo@o2.pl --- (In reply to Alexandre Julliard from comment #2)
When the window is controlled by the X11 window manager there's no way for Wine to intercept the resize request.
intercept ? likely not, however as far as X11 goes, there's XSetWMNormalHints with PMinSize/PMaxSize...Not sure if it would get 100% of the desired effect, but some of it should be possible.