Hi,
in version 3.1.1 the Win32Display::DispatchEvent code has been changed.
in the handler SIZE_RESTORED and SIZE_MAXIMAZED removed the notification mSizeChanged (...)

in 3.1.1 there is another way to resize IView?

Could you please report this in our bugtracker, this was a regression and we have to fix it.

IView has a SetSize() method you can manually call, but I guess in the meantime you can just copy the code from WM_EXITSIZEMOVE to WM_SIZE to force the SizeChanged event to be raised.

We broke this when fixing (#2098) for D3D12. Sending too many WM_SIZEs was crashing a driver.
It will be fixed in 3.1.2. Please, use Win32Display source from 3.1.0 meanwhile.

OK

bugtracker#2165

Thank you!