macOS - arranging windows doesn't fire setFrame->WM_SIZE

[Youlean]

WDL/WDL/swell/swell-dlg.mm

Line 2518 in b84ad4f

To patch this this can be added:

- (void)windowDidResize:(NSNotification *)notification 
{
    NSWindow *window = notification.object;
    [window setFrame:[window frame] display:YES];
}