[Feature Request]: Let user define file extensions that should use the .txt thumbnail preview.

[Olkris2666]

Checklist

• I am using an up-to-date version.
• I have read the documentation.
• I have searched existing issues.

Description

Many "file formats" are just .txt with a different file extension.
e.g. : .md / .json / .bat

Solution

It would be cool if the user could right click a file with a certain uncommon file extension, and tell TagStudio "yes, this is actually just a .txt", that way TagStudio can treat it as such and display its contents.

Alternatives

No response

[SkeleyM]

would this be as a file to file basis like this:

or as a 'treat every file with this extension as txt' kind of thing

[CyanVoxel]

Text is also very specific, naturally if the user is given an option to try and render a file extension with an internal renderer outside it's known MIME type then they should at least have the option to choose from any of the types of renderers we have, not just text.

I also don't think this should be an right-click option on each file but rather a global setting that overrides known file extension MIME types with a user-specified renderer.

As a much simpler alternative, I noticed this feature request came from wanting to associate a specific file type as a text file. We could just add that to the list of text files in our internal lists since it doesn't seem to be hitting any matches with the MIME type fallback.