IR does not update when render region changes

[kahein]

Hi,
Great release

I noticed two bug if we can say it's a bug.

- In render region (blowup ) the IR don't update when we move the region till i move the view-port in perspective and camera mode

- when i switch the render region in other mode like just region, the IR VFB don't update the part outside the region even if Clear VFB was already checked

[maru]

So it looks like the changes done to the viewport selection overlay are not considered as updates. Not sure if fixable.

[maru]

Issue 1 is fixed. (Blowup result not updating in IR when moving the selection in viewport)
Issue 2 is still valid and will be addressed. (VFB not cleared outside of the region render)

[maru]

Surprisingly, issue 2 seems to be too complicated to fix at the moment. It will be deferred.
The workaround is to run IR in the floating window and use built-in regions.