fix: use correct state when doc changed externally

[dkrym]

There is a bug in suggestion plugin since Tiptap v1 when you use Collaboration and Mention together. It is bit edge case, but we actually ran into it in prod.

Open 2 editors (using collab)
Editor1 (user1): type some text and then enter Mention
Editor2 (user2): type/paste text anywhere before user1’s position
Editor1 (user1): confirms mention
Mention is at wrong position (replaces text at wrong position)

Reason:
When you use mention locally, from variables “handleStart, handleChange, handleExit“ only 1 is true (as it goes: start->change->...->change->exit).

When text in front of mention is changed in collab, it is not considered change (handleChange==false) as query is the same. Instead of it handleExit==true, handleStart==true and handleChange==false which cause that onStart is called with props from “prev” state instead of “next”.

When typing, the position is wrong by 1:

When pasting text, it is wrong by the length of pasted text:

[philippkuehn]

thanks!