Fix Control nodes emitting unnecessary resized signals

[Geometror]

Fix Control nodes emitting unnecessary resized signals due to floating point precision issues.

Fixes #93832
Might fix #48935 (for 4.3).

[Naros]

Hi @Geometror, tested but it behaves strangely in the GraphEdit:

I don't see the excessive resize events, but the curves don't redraw when moving a GraphNode on the canvas.
As soon as I resize the GraphNode, the curves redraw.

[Geometror]

@Naros Should work now, I just missed a code path while restructuring the method.

[Naros]

Works as expected, I don't notice any unnecessary resize events and the GraphEdit works when panning, moving nodes, scrolling the canvas both with/without snapping. 👍 Will this be backported to 4.2 as well?

[akien-mga]

Thanks!