Fix ViewPanner panning-mouse-warp

[Sauermann]

Currently the mouse cursor jumps in unexpected ways, when a ViewPanner is used in SubViewports or embedded Windows.

This is caused by providing wrong coordinate systems to Input::warp_mouse_motion.

This PR replaces the use of Input::warp_mouse_motion with Viewport::wrap_mouse_in_rect and makes sure, that the correct coordinate systems are used.

This change makes it necessary, that all classes, that currently use ViewPanner, need to provide the correct Viewport to ViewPanner (necessary changes are included in this PR).

The obligatory before and after:

BugViewPannerMouseWarp.mp4

FixViewPannerMouseWarp.mp4

• resolve ViewPanner panning-mouse-warp doesn't work in SubViewports or embedded Windows #100438

One long-term goal of this PR is to move Input::warp_mouse_motion from Input to Viewport. It doesn't directly require any functionality of the Input class and so it makes sense to move it to a class that is not in core.

• updated 2024-12-16: rename replacement-function to Viewport::wrap_mouse_in_rect

[Geometror]

Tested locally on Windows 11 after I realized that mouse warping doesn't work on Wayland currenlty (although unrelated to this PR).
Works great! Implementation looks fine too, although I would call the new method Viewport::wrap_mouse_in_rect instead of Viewport::warp_mouse_into_rect
(wrap not warp, no typo here ;) Since wrapping more accurately/commonly describes the concept of something going out of bounds on one side and appearing on the other; so wrapping the mouse pointer in[side] the rect is done via warping it to specific position at the right time. Besides that, "wrap...into" implies that it just moves the mouse into a rectangle).

[Sauermann]

Makes sense. I have updated the function name.

[KoBeWi]

Does set_viewport() need to be called more than once or the viewport could be part of setup() maybe?

[Sauermann]

Does set_viewport() need to be called more than once or the viewport could be part of setup() maybe?

setup is not called from GraphEdit, so I have created a new function, that doesn't rely on setup.

When moving the node to a different location in the scene tree, it's possible, that setting a different viewport is required. So I believe, that ENTER_TREE is the right place to include it.

[KoBeWi]

Overall looks fine.

[Repiteo]

Thanks!