I'm trying to better explain my question:
1- I'm in Perspective view and I hit the render button
2 - I go from Perspective view to Top view (for example) then I return in Perspective view
3 - render window restart the render
Hi - when you are changing the view, you are also switching from a 4 viewport layout to a single viewport, meaning the viewport size is changing, or the camera position/fov is changing, and this is causing the render restart.
Moreover, you can see a bug (maybe a bug) about Render Region. If I select from left to right render region works fine. If I select from right to left (and I select out of the rendered image) render region doesn't work correctly.
I couldn't replicate what you show in the video, however I know that the render region will be ignored if you drag the render region box outside the render bitmap - so I suspect the logic behind this is messing up. It appears to be a cosmetic issue, so I will leave it for the moment, unless if because a serious issue for you.
Paul