Only update render target directly if ARVR mode is off #54258
Merged
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When using XR plugins like the Oculus Desktop and OpenXR in combination with switching the ARVR mode on for the primary viewport, window resizing will attempt to resize the viewport while the XR server is now in control of this viewport.
This PR makes sure that we do not resize the viewport unless the ARVR mode is turned off, or at the opportune moment when it is on. Should also fix some related issues such as switching transparency.
Fixes #41889