* Add a store to indicate whether input trigger is active
Button state is then indicated by: caretIsInBold XOR boldTriggerActive
* Fix surrounding where normalization is tripped up by empty text nodes
* Add failing test for unsurrounding
* Fix failing test
* prohibitOverlapse does not need to be active, if aboveEnd is null
* Reinsert Italic and Underline button
* Refactor find-adjacent to use sum types
* Simplify return value of normalizeAdjacent
97b28398ea