Drawing unnecessary gets reloaded on tab switch
Happened on Firefox / Windows
Can't really reproduce this.
This is probably related to browser unloading the tab in order to save CPU cycles / memory. In firefox this is a feature that can be turned off. However, I don't know what the solution here is, or furthermore whether anything can be done at all.
The problem here could be reduced if we were to save the drawing locally to reduce network traffic and therefore ping. This would in general improve page resize and undo as well.
If this bug still occurs, its impact should be relatively low now, given the performance improvements in 450f5d19d64a01005284046a350b0b940430c06e