SubViewportContainer has limited mouse-cursor support

[Sauermann]

Godot version

v4.2.beta.custom_build [e5bacbc]

System information

Debian Linux X11 Xfce

Issue description

SubViewportContainer currently doesn't set Mouse Cursor, in order to let the content of the SubViewport set the mouse cursor.

This behavior was introduced while resolving #74805. A more elaborate solution needs to be implemented, in order to solve all use-cases.

Original mention of this issue: #79805 (comment)

After fixing this issue, #84661 needs to be reevaluated again.

See for details: #84661 (review)

Steps to reproduce

SceneTree:

• SubViewportContainer with a MouseCursor not Arrow
  • SubViewport without any children-nodes.

When hovering over the SubViewportCintainer, the specified MouseCursor doesn't show.

Minimal reproduction project

n/a at the moment

[conde2]

I'm having the same issue I want to change the mouse cursor for my SubViewportContainer and its not possible atm.