We call UpdateWindow very early in our window creation, before we get
an openGl surface and before our message queue is ready. This results
in WM_ACTIVATE, WM_SIZE, WM_MOVE, and WM_PAINT messages sent to us
at a time when GetMessageTime() returns zero. This makes our event
message times have a gap between the fourth and fifth messages, equal
to the time since system start. There is no downside to not calling
this at this time.
Pull Request: https://projects.blender.org/blender/blender/pulls/117965
b32effdaa8