Implement Alt + Mouse wheel to adjust FOV in the 3D editor viewport

[Calinou]

master version of #54207.

This allows for quicker FOV adjustments compared to using the View menu.

This closes godotengine/godot-proposals#3428.

Preview

3d-editor-quick-fov-adjust.mp4

[fire]

@Calinou Are there any other uses other than zoom via fov? Zoom speed up is the regular mouse wheel. Trying to see if anything else can use this valuable spot.

The proposal is to make it easier to pick an object in the scene far away. This achieves that.

Can you check what happens when the values are infinite or nan?

This introduces two ways to pick an object in the scene far away.

1. fov changes
2. physically move

[jcostello]

Do we have a reset command or button?

[Calinou]

Can you check what happens when the values are infinite or nan?

The FOV scale is clamped between 0.1 and 2.5 (it defaults to 1.0). The final FOV is clamped between 1 and 179 degrees, so it's impossible to reach a zero, infinite or NaN value.

Do we have a reset command or button?

Resetting is done by setting the FOV in the 3D viewport's View menu or restarting the editor. The FOV scale factor will be set back to 1.0 when you press OK in the dialog.

[Calinou]

Added keyboard shortcuts to increase FOV (Ctrl + Minus), decrease FOV (Ctrl + Plus) and reset FOV (Ctrl + 0).

[akien-mga]

Thanks!

[akien-mga]

Note: This was reverted in #64070.

[Calinou]

Note: This was reverted in #64070.

To clarify, only Alt + mouse wheel was removed. The keyboard shortcuts are still here and they can be adjusted in the editor settings, as they usually don't get in the way.