Two are not enough "several users" to start another extra work

For me, i will try to use the save&reload thinggy.
Just brainstorming:
I am not experience enough to understand how is that coloring related to undo queue,
... i believe your words ... but can't you just turn this "Changed Indicator" --color to actual background color?
I mean i am not against the undo but just wanna clear the last changed-
markers... to better see the next changes.
It is just the visible effect of this feature... not the back ground.
Yes, the user will lost the view of the last markers and didn't see anymore what he has modified,.. but he!, no one has to use this feature.
Anyway THX for an open ear
