Redrawing during window move/size?

I'll try a canvas. In BlitzPlus, canvases were not good for OpenGL viewports.

I also found the solution for panels. This is really nice because I don't have to have a bunch of extra render calls in every waitevent() loop:

Extern "Win32"
	Function SetWindowLong(hwnd:Int,index:Int,newlong:Int) = "SetWindowLongA@12"
	Function CallWindowProc:Int(prevwndfunc:Int,hwnd:Int,msg:Int,wparam:Byte Ptr,lparam:Byte Ptr) = "CallWindowProcA@20"
EndExtern

Const GWL_WNDPROC=-4
Const WM_PAINT=15

hwnd=QueryGadget(Viewport.panel,QUERY_HWND)
Global OldWindowCallback=SetWindowLong(hwnd,GWL_WNDPROC,Int(Byte Ptr(WindowCallback)))

Function WindowCallback(hwnd,msg,wparam:Byte Ptr,lparam:Byte Ptr) "win32"
	Select msg
		Case WM_PAINT
			renderworld
			sync
	EndSelect
	Return CallWindowProc(OldWindowCallback,hwnd,msg,wparam,lparam)
End Function