fix(18204): Refactor the location of a group and its nodes #233
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See https://hivemq.kanbanize.com/ctrl_board/57/cards/18204/details/
This PR improves the computation of the initial location of a group and, at its deletion, of its nodes.
The changes guarantee that, when a group is created, the selected nodes remain at the same visual position on the canvas. Similarly, when the nodes are ungrouped, their visual positions remain the same on the canvas. when the group is deleted.
The new implementation ensures that repetitive grouping and ungrouping don't introduce any "drift" on the visual canvas.
The PR also fixes two visual aspects of nodes on the graph:
Before
After