Flyspell generates overlays for links and alike

[TobiasZawada]

Expected behavior

Links like image:ImageDir/myLovelyCat.png[] are not checked by Flyspell

Actual behavior

Currently, Flyspell puts overlays on links which are spelled erroneous.

Steps to reproduce the problem

Try the following Adoc:

== Title

Links like image:ImageDir/myLovelyCat.png[] are not checked by Flyspell

Adoc-Mode version information

adoc-mode, version 0.8.0-snapshot

Emacs version

GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo version 1.16.0) of 2023-08-02, modified by Debian

[bbatsov]

This approach might be relevant https://emacs.stackexchange.com/questions/5415/how-can-i-make-flyspell-ignore-urls

[TobiasZawada]

This approach might be relevant https://emacs.stackexchange.com/questions/5415/how-can-i-make-flyspell-ignore-urls

I know the flyspell-mode-predicate property of major mode symbols and I have already a branch for it.
My first approach is to let font-lock mark the relevant spots with an adoc-flycheck-ignore text property and only test for this property in the predicate function. With other words: re-use all the hard work that font-lock already does anyway.

[TobiasZawada]

@bbatsov Before I create a pull request for this issue I would like to merge !48.