[GraphEditor] Edge: Correctly update the EdgeMouseArea when moving nodes
#2613
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Description
This pull request correctly updates the mouse area over edges when nodes these edges are connected to have been moved.
Prior to it, the mouse area of each edge was set once and never updated afterwards, meaning the edge remained selectable if and only if it did not move too much from its original position. The curve scale of the mouse area is now recomputed every single time the size of its edge has changed (i.e. whenever a node it is connected to has been moved).