don't just delete the m3u file for multi-part roms

[Percentnineteen]

Description
multi-disk roms only deleted the .m3u which doesn't claw back much disk space. Logic is added to traverse the .m3u file and delete the files that it points at

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR

Screenshots

[gantoine]

I'm going to test this in a bit since I don't think the new behaviour is doing what we're expecting it to...

[Copilot]

Pull Request Overview

This PR enhances the ROM removal flow by deleting all files referenced in a multi-part ROM’s .m3u manifest instead of only removing the manifest itself.

• Replaces the inline os.remove in the contextual menu with a call to a new helper.
• Introduces _remove_rom_files to traverse .m3u lists and delete each referenced file.
• Preserves single-file ROM removal behavior for non-multi ROMs.

Comments suppressed due to low confidence (3)

RomM/romm.py:874

• Missing docstring for _remove_rom_files. Add a brief description of the method’s purpose, parameters, and behavior.

def _remove_rom_files(self, rom):

RomM/romm.py:880

• [nitpick] The variable f is too generic. Consider renaming it to m3u_file or file_handle to clarify its role.

with open(rom_list_path, "r") as f:

RomM/romm.py:877

• Add unit tests for the multi-part ROM deletion path to ensure that all files listed in the .m3u are correctly removed and edge cases (empty lines, missing files) are handled.

if rom.multi:

[Percentnineteen]

I'm going to test this in a bit since I don't think the new behaviour is doing what we're expecting it to...

It worked correctly for me when I tested on both a psx game with multiple chd files in the .hidden directory as well as when I tested on a nds game which is by nature a single file.

Is there a particular concern you had?

[gantoine]

Is there a particular concern you had?

No concern, I'm just having trouble visualizing the new logic. Once I run things on my device with some logs it should all make sense!

[gantoine]

Ah I get it now! I would have deleted matching files in the .hidden folder but I think your approach is more robust. 💪🏼