Two-finger scroll on Mac in Preview3D doesn't zoom in/out

[dgholz]

Material Maker version:
1.4a3, from bc702ff

OS/device including version:
MacBook Air M1, MacOS Sonoma 15.3.1

Issue description:

Two-finger scrolling in Preview3D seems to act like a faster, choppier left-click drag, and doesn't change the zoom level.

Steps to reproduce:

Scroll with two fingers in the Preview3D window.

Here I've captured a left-mouse button click and drag, a right-mouse button click and drag, and then two-finger scrolling vertically & horizontally.

[dgholz]

I use the two-finger gesture because usually it scrolls (pans) in other apps, and I'd expect it to scroll (zoom) here. Especially as there's no keyboard shortcuts or UI gizmo for zoom in the Preview3D panel.

[Calinou]

It should be possible to implement support for InputEventGesturePan and InputEventGestureMagnify, but it'll only work on macOS due to limited platform support for these events.

See godotengine/godot#94904 for an example of this.