Color markings for .log files, not for .txt files

[vincentkoevoets]

Describe the bug
Allright guys, I'm at a loss. I've spend the better part of today trying things, but I'm not getting this done. My problem is that Text opens my .log files correctly, but with colored text and also parts are italic. It recognizes the .log files as plain text correctly, because I have added the log file type as text/plain to mimetypemapping.json. So no rich editing, like it's supposed to do. But it appears to be formatting the text in some way anyway. The .log files are essentially just text files, but with a .log extension. If I change the extension in Nextcloud to .txt, the file loads correctly as plain black text without any formatting.
Edit: FYI: the log files in question have nothing to do with Nextcloud or Text, they are just log files for things I'm running on a server.

To Reproduce
Steps to reproduce the behavior:

1. Open file with .log extension.
2. See parts of text are colored, and some text in italic and maybe some other formatting.
3. Close file, and change extension to .txt.
4. Open file again, and behold! A plain text file without any formatting.

Expected behavior
Any file type that has been added as [text/plain] should be shown just like that: as plain text. (right?)

Screenshots
File with .log extension

Same file but now with .txt extension

Server details:

• Nextcloud version: 28.0.1
• PHP Version: 8.2.13
• Database: Mysql 8.2.0

Client details:

• OS: Windows, Linux
• Browser: Chrome
• Browser version: 120.0.6099.217
• Device: Laptop, phone, desktop

Nextcloud log (data/nextcloud.log)

Nothing is showing in the logs

Browser log

I'll add this when needed.

[joshtrichards]

Reproduced.

[vincentkoevoets]

Happy anniversary for this bug 🎉 Would there be any way to solve this? Except from changing all my .log files to .txt files? I mapped and aliased .log file as plain text, I don't really see what else I could do.

[juliusknorr]

I'm not entirely sure what goes wrong but to debug this further one could check out what syntax highlight is loaded when opening such files, here would be some code pointers:

text/src/components/Editor.vue

Lines 578 to 582 in c7f0c29

	const language = extensionHighlight[this.fileExtension]
	|| this.fileExtension
	loadSyntaxHighlight(language)
	.then(() => {
	this.$editor = createPlainEditor({ language, extensions })

https://github.com/nextcloud/text/blob/c7f0c2932980e71d8c94fc4f155dbdf33852a08a/src/helpers/mappings.js

We have some manual mapping but if we don't find an entry in there we fallback to the file extension, which could then lead to odd highlight.