Improve multi-block tree-view right-click menu

This improves the right-click menu for the tree-view in the
multi-block inspector panel.

Change-Id: I4af4bc4b6e9c2f0acc4da9c519302897fb3a209e
Merge topic 'composite-data-display-attributes' into next

b18923d Improve multi-block tree-view right-click menu