Feature idea: Custom resolution input + per-display profiles for foldables

[pqzmggg]

Summary

Allow entering a custom screen resolution (width × height) in container settings, and optionally keep separate resolution profiles for each display on foldable devices.

Motivation

The recent default screen size detection and the 960p option are great improvements, but the resolution list is still preset-based and mostly assumes 16:9 or common handheld ratios.

Foldables don't fit those presets well:

• The inner display is close to square (around 1.1:1 on recent Galaxy Z Fold models)
• The cover display is very tall (around 21:9)

Today I have to pick a 16:9 preset, which leaves large black bars on the inner screen or stretches the image. A custom resolution matching the panel's aspect ratio (or a scaled-down version of it for performance) would make games fill the screen properly.

Proposed UX

Custom resolution

• Add a "Custom…" entry to the screen size dropdown
• Width / height input fields with basic validation (e.g. even numbers, min/max bounds)
• Show the resulting aspect ratio next to the input

Helpers

• "Match device aspect ratio" button that fills in a resolution with the current display's ratio
• Quick scale presets based on the native resolution: 100% / 75% / 50%, so users can trade sharpness for FPS without doing the math

Per-display profiles (foldables)

• Optionally save one resolution for the inner display and one for the cover display
• Pick the matching profile automatically at launch based on which display is active

Nice to have

• Per-game override, so a heavy title can run at a lower custom resolution while lighter games use native
• Clear note in the UI if the game itself doesn't list the custom resolution in its own settings, with a hint to use windowed/borderless or edit the game's config