Restart IR only if it is necessary

[Bzuco]

There are many cases which cause restarting IR:
opening ME, going into submap, rollout some material section, switching between material slots
staying with mouse over some object in viewport to popup small hint with object name,
pressing keys Q, W,E,R
selecting object but don't move it
...

[maru]

My guess is that in most of those cases it's caused by 3ds Max. Although it does not mean that there is nothing we could improve. :)

[Ondra]

some are fixed, rest is duplicate: https://forum.corona-renderer.com/index.php/topic,8879.0.html