json-mode-get-path-to-point does not work with font-lock disabled

[njsand]

M-x json-mode-get-path-to-point (also on the C-c, C-l keys) does not work if font-lock is disabled.

For example:

1. Start emacs
2. Do M-x font-lock-mode to turn off syntax highlighting
3. Position the cursor on the 'a' in the following code: (inside the string literal)
   {
   "a": 1
   }
4. Do M-x json-mode-get-path-to-point
5. See that "nothing to copy" is printed in the echo area. This is wrong, we should see the path to the "a" key.

Parsing / interpreting the JSON shouldn't depend on syntax highlighting being enabled, so I'd call this a bug.

[UwUnyaa]

There's a huge chance I'll retire this project in favor of merging my features into https://github.com/joshwnj/json-mode. As for now, I'd recommend using that mode, as it provides similar functionality, and I'm trying to bring whatever is missing into it. I'm stuck with an issue with idle timers in Emacs 27, and I haven't had much energy to try debugging it, as nobody knows why it's happening.