[bug] The text/* mime-type handler is a bit too strict

[dtomvan]

Cosmic-files version:
0.1.0~1730233777~24.04~20f9292

Issue/Bug description:

• The mime-type file-opener really strictly handles its types;
• It even does so when using "open with";
• I cannot choose an "other application" to try to handle a file, it only allows me to download a flatpak which also handles the exact same filetype;
• For example, when opening a *.tsv file, it correctly detects text/tab-separated-values, but it only allows me to use libreoffice calc.

Steps to reproduce:

• Create a file /home/tom/somefile.tsv
• Navigate to /home/tom in cosmic-files
• Right-click on somefile.tsv
• Click on "Open with..."

Expected behavior:
I would expect that it would allow me to use any application (that handles plaintext, text/plain, text/* for that matter) to edit a plain text file such as .tsv. For example, neovim handles text/plain, but I cannot in any way use Neovim to edit a tsv file through cosmic-files.

Other notes:
Nautilus does allow the user to specify any text editor (or any application at all for that matter, but full disclosure I don't like that design) to open text/tab-separated-values:

[SamuelBorn]

I am experiencing the same on cosmic-files https://github.com/pop-os/cosmic-files/commits/39e88cb3b176208138a68675201c49bb2f19c259
on Fedora Linux.

My default PDF reader should be zathura, yet it does not show in the context menu so I cannot select it.

A quick workaround is xdg-mime default org.pwmt.zathura.desktop application/pdf