[GGn0]

Fixes #2865

Problem
On precision touchpads, MouseWheelEvent.getWheelRotation() is always 0 and the movement is only reported through getPreciseWheelRotation(). The direction checks use getWheelRotation() < 0, which is never true for these events, so every swipe is treated as a down/right scroll.

Change
In MouseWheelListenerBase.java and ScrollViewInteraction.java:

• Direction test: getWheelRotation() < 0 → getPreciseWheelRotation() < 0
• Zero check: getWheelRotation() == 0 → getPreciseWheelRotation() == 0.0, for consistency. Touchpad events don't reach this check today, so it isn't needed for the fix and I'm happy to drop it.

The scroll amount logic is unchanged. A classic mouse wheel reports whole numbers in both methods, so its behaviour is the same as before.

Testing
Built from master and tested on Windows 11 with an HP ZBook Power G10 precision touchpad:

• Two-finger scroll up/down and left/right: all four directions now work
• Shift+scroll horizontal scrolling
• Ctrl+scroll zoom
• Classic mouse wheel: unchanged

Also tested on an older laptop with a non-precision touchpad: scrolling worked before the change and still works after it.

Not tested: macOS and Linux touchpads. Feedback from anyone with that hardware is welcome.

[dbarashev]

Do you have any idea if it is possible that on some hardware getPreciseWheelRotation return 0 while the non-precise method returns something different from 0?