Add 'Menu Toggle Without Hotkey Enable' option

[BrandonKowalski]

Summary

Adds a new option under Settings > Input > Hotkeys that allows Menu Toggle to bypass the Enable Hotkey modifier.

Handheld users (Retroid, Anbernic, etc.) with a dedicated menu/back button can enable this so Menu Toggle works without holding Enable Hotkey, while all other hotkeys still respect it.

Addresses #18396

Test Plan Checklist

• Build RetroArch and confirm no compilation errors
• Settings > Input > Hotkeys shows the new "Menu Toggle Without Hotkey Enable" toggle
• With Enable Hotkey set to SELECT and Menu Toggle set to a different button:
  • Setting OFF: Menu Toggle requires SELECT held (current behavior)
  • Setting ON: Menu Toggle works alone; other hotkeys still require SELECT

Thanks for considering! Appreciate everything you do to make this hobby so awesome!

[hizzlekizzle]

I'm personally not a fan of this, not because I don't think the functionality is good, but because there will instantly be requests for a bypass for fast-forward (that is, most of the requests for this I've seen are for menu and FF), so we'd need a setting for that, too. I don't imagine it will stop there, either, unfortunately, and I don't think adding a separate bypass for every hotkey (or even a significant percentage of them) is sustainable.

[BrandonKowalski]

I understand the concern about the slippery slope. My perspective (for whatever it's worth 🤣) is that this PR restores functionality that was present, albeit unintentionally, in RetroArch prior to version 1.22.0.

That said, Menu Toggle is arguably unique. On many handheld devices menu is a dedicated physical button. Fast-forward and others don't share that same hardware justification, which could serve as a reasonable line to hold.

[hizzlekizzle]

yeah, that's the same reasoning we use for allowing menu_toggle into the autoconfig profiles. we can see what others think about it. I'm not dead-set against it, so if others are into it, I won't try to torpedo it :)

[LibretroAdmin]

I don't really mind if it gets merged. I guess we can ask @warmenhoven as well

[cmitu]

That said, Menu Toggle is arguably unique. On many handheld devices menu is a dedicated physical button. Fast-forward and others don't share that same hardware justification, which could serve as a reasonable line to hold.

I think this is also true for some configuration used in arcade cabinets, where users can reserve a dedicated key (usually mapped to tab for MAME) to open the (configuration) menu.

[josegonzalez]

Any chance this could get merged? Most of my retro devices run some form of Retroarch, and being able to trigger the menu toggle without needing two buttons would be great.