Start the drawing thread when rendering to "it" as well. This works around the issue of not being able to turn off IPR when rendering to "it", using the "Z" menu. It was working when in rendering in the viewport itself, so seems like that's a better to handle stopping in both cases.
Start the drawing thread when rendering
to "it" as well. This works around the issue
of not being able to turn off IPR when rendering to "it", using the "Z" menu.
It was working when in rendering in the viewport itself, so seems like that's a better
to handle stopping in both cases.

prman-pixar/RenderManForBlender,prman-pixar/RenderManForBlender