Disable MITK Display interactions when side viewer is on
In MITK you cannot define the scope of interactors, that is on which render windows they should be enabled. If you load an interactor, it will be enabled for every render windows of the application.
This can lead to conflicting interactors and unwanted interactions. E.g. as part of #4806 (closed), the MITK Display interactor had to be disabled for the time when the thumbnail viewer was active, otherwise, the interaction events in the thumbnail view were processed both by the thumbnail viewer interactor and the interactor of the MITK Display. (If NiftyView was used.)
The same is happening in the side viewer, when it is used with the MITK display.
The MITK display interactor should be disabled when the side viewer is active.