Add features to InteractiveViewLink
This commit add features to the interactive view link :
- Opacity: one can change the level of opacity of the view link widget
- "Hide linked background" option: enabling it hides the background of the linked widget.
To do that it was needed to add:
- A method to access the name of a given link ;
- New Qt widgets in the pqCameraDialog ;
- Some bug fixes in InteractiveViewLink.
The opacity feature need to limit this feature to a single interactiveViewLink by view or it may trigger infinite rendering loops.
Fix #16910 (closed)