qt/CompositorDComp: early call render on resize
on window resize, it seems that qt event loop is overwhelmed with resize
events, making timer event of requestUpdate called very late, that
causes delays in rendering
manually call render to avoid out of sync window painting
ref #25572
before
video-2022-01-28_08-24PM
after
video-2022-01-28_08-23PM
Edited by Prince Gupta