Unexpected horizontal scrollback behavior

[usualwitch]

Description

When using focus-follows-mouse with horizontal focus-column bindings, moving the mouse near the screen edges can trigger unintended scrolling, even when there are no partial columns visible.

Configuration

input {
    focus-follows-mouse
}

binds {
    Mod+L { focus-column-right; }
    Mod+H { focus-column-left; }
    Mod+WheelScrollDown { focus-column-right; }
    Mod+WheelScrollUp { focus-column-left; }
}

Steps to Reproduce

1. Ensure the screen shows only full columns (no partial columns visible).
2. Use a keybinding or Mod+mouse wheel to scroll the screen right.
3. Wait for any duration (even up to a minute).
4. Move the mouse near the left edge of the screen.

Expected Behavior: Moving the mouse should not cause any horizontal scrolling, as there are no peek windows outside the screen.

Actual Behavior: Moving the mouse near the left edge of the screen causes the screen to scroll back.

The same thing happens if I scroll the screen left then move the mouse near the right edge of the screen.

Additional Notes

This scrollback only occurs once. Seems like it only undos the most recent scrolling action. Is it possible to disable this auto-scrollback behavior?

System Information

• niri version: 0.1.7-1

• Distro: archlinux

• GPU: Intel Corporation Alder Lake-P GT1 [UHD Graphics]

• CPU: 12th Gen Intel(R) Core(TM) i7-12650H

[YaLTeR]

Hi, we're discussing this here: https://github.com/YaLTeR/niri/discussions/491

[YaLTeR]

Yesterday I pushed a setting that should fix this:

    focus-follows-mouse max-scroll-amount="0%"