Gripper action unselects entity tree

[i-make-robots]

Describe the bug

To Reproduce Steps to reproduce the behavior:

1. Run app.
2. Follow wiki instructions to add a gripper or load testGripper.zip (unzipped)
3. select Gripper Entity.
4. In Component view (bottom right), find RobotGripperComponent block.
5. Click "Grab" button.

Expected behavior Scene\box moves to Scene\Gripper\box. the selected entities does not change in the Entity Tree Panel.

Screenshots Actual results incorrect:

Platform (please complete the following information):

• OS: Windows
• App Version 2.6.1
• Java version 15

Additional context com/marginallyclever/robotoverlord/swinginterface/entitytreepanel/EntityTreePanel.java is the panel in question. calls to treeModel.reload() reset the list of selected rows. There needs to be a way to

• preserve the list of paths of selected entities
• run the reload
• and restore the selected state of exact path matches
• without triggering an infinite loop of select + unselect
• without breaking the undo system

[i-make-robots]

[i-make-robots]

maybe related: https://docs.oracle.com/javase/tutorial/uiswing/events/treeselectionlistener.html

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