Switch back to previous settings when exiting tool

[jlampel]

RetopoFlow enables certain snapping, auto-merge, and viewport overlay settings when switching to one of the tools. Currently only the retopology overlay is disabled when exiting the tool, but all previous settings should be restored as well.

[jlampel]

Along with this, user changes to the settings while a RetopoFlow tool is active should be saved on exit for the next time the tool is active. For example, I need to change the auto-merge distance from 0.01 to 0.001, but when I change tools and come back, it has reverted back to 0.01.

Side note, RF probably doesn't need to touch the distance setting as that is highly specific to each project

[vxlcoder]

i have code in place to do this (or at least it should). do you have specific cases where it isn't happening, so I can look more closely?

i've already removed the changing of auto-merge distance, so that's done.

note: it's not clear how to handle case when blender saves a blend file with properties adjusted by RF, as there's not a clear way to store previous setting across save/load (maybe a scene property??). for example, start up file.