While i'm the only one who can edit my vg base, even that's sometimes no protection. For the 3rd time in the last week, an "apply style to base" happened. The first time it happened, i assumed that i simply misclicked, but fairly certain that wasn't the case now. Just sort of happened when i entered the editor this last time, changing the entire base to the style of the most recently added room. Rather a pain to correct.
A restore or undo ability is definitely needed. (And why is there no confirmation needed for those base-wide changes?)
