@Shida @Erica
This is interesting. When I ran the test you described @Mark_Eichenlaub, I found the opposite results that my incognito and normal windows could in fact communicate with eachother. However, I tried the test again with the state of whether the bookmark pane is opened or closed. In this case, exactly like the post above, the state could communicate within groups of tabs that were or were not Incocognito, but not between groups. @Erica When you say per-session, is this what you are talking about? Do Incognitio and normal tabs of Chrome count as different sessions but tabs within those two groups count as the same session so that there can only be a total of two sessions within Chrome?
Personally, I have rarely found it convenient for collapsed state to be synced between all my documents. In fact, I’d go as far as to say I wish my collapse state was not saved at all, and that I had the ability to exit my document in any state, and return with all items collapsed every time no matter what. I don’t know how many others would find this useful, but I know I would appreciate the option because to me it feels more neat and tidy.