Simplify pathbar helper function and fix #222

There are still lots of helper functions that are only ever used once and that redundantly fetch stuff which do not actually contribute to making the code easier to understand. This MR removes those helper functions, and actually makes the whole pathbar thingie easier to get.

It also schedules more edit stack pages for destruction after they have been edited, so we don't see pages hanging around with stale password visibility settings or old icon colors etc...

Fixes #222 (closed) while doing that. Given that the regression is small and the fix buried in a larger cleanup MR, we might want to merge this only after a release?!