Fontification gets irritated for long texts

[quazgar]

For longer markdown documents, markdown-mode sometimes (hard to reproduce) switches the highlighting in the middle of some texts, without and special characters in the vicinity.

See the following image for an example screenshot:

Expected Behavior

The highlighting should only change at special characters.

Actual Behavior

The highlighting sometimes appears to be a bit random, with long range interactions: If this bug appears and I change text further up the documents, the errors may seem to move around, sometimes disappear, sometimes reappear again.

Steps to Reproduce

I was not able to reproduce this issue reliably. It only happened for long documents, and sometimes restarting Emacs helps. M-x normal-mode typically only helps for a short time.

Backtrace

Software Versions

• Markdown Mode: markdown-mode, version 2.5-dev, from Melpa, version: 20210831.1507
• Emacs: GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo version 1.16.0) of 2021-03-28, modified by Debian
• OS: Debian

[syohex]

Could you give us the long markdown text which occurs this issue ?

[quazgar]

I am sorry, that specific file is too confidential. But I will post the next example that I can give to the public.

More importantly, I will try to find a way to reproduce the behavior. It does not show on loading the file, but only after some editing. Actually reloading the file (M-x normal-mode) sometimes, but not always, helps to reset markdown-mode's state.

[njsand]

In the issue description, when you say "without and special characters in the vicinity" do you mean "without any special characters?" Just not quite sure what you're trying to say there - maybe just a typo.

[quazgar]

Sorry for the long delay. Yes, it was just a type, I meant "any".

As the screenshot shows, there are no special characters in the word "processes", for example. This is what I meant, the fontification changes from one character to another, without any special characters in between.