Flashing back and forth children nodes in PackageNode about jetuml HOT 1 CLOSED

This issue occurs when trying to auto-scroll while dragging with a selection that exceeds the size of the viewport (area visible in a diagram tab). The auto-scroll feature attempts to always show the entire selection in the direction of the drag (e.g., dragging right, the right parts of the bounds). The calculations are correct but the user experience is not great.

To mitigate the issue, this fix implements two changes:

1. The bounds of parent nodes are not automatically included in the bounds of a selection, which makes it possible to move the nodes within a package (for example) without the viewport trying to show the entire package. In small viewport environments, the UX will be greatly improved.
2. When the bounds of the selection exceed the viewport in a dimension (X or Y), auto-scrolling automatically stops to prevent the jitter. Users can still scroll manually to adjust their viewport.

from jetuml.