Fix crosshair initialization
Summary:
React if the mxnmultiwidget editor is opened / closed
This allows to activate the render menu / crosshair
after all render window (widgets) have been initialized.
Test Plan:
manual testing
- open MITK, close the StdMultiWidget
- open the MxNMultiWidget and load a dataset
- check if the corsshair is visible / moveable
- check if the render window menus works
- change the number of render windows
- change the layout
- check if the crosshairs are visible / moveable
- check if the render windw menus work
Reviewers: s434n, kislinsk, O1 MITK Reviewer Group I, O3 MITK Reviewer Group II
Reviewed By: kislinsk, O1 MITK Reviewer Group I, O3 MITK Reviewer Group II
Subscribers: kislinsk, s434n, kalali
Maniphest Tasks: T26627
Differential Revision: https://phabricator.mitk.org/D691