Define a new custom multi widget editor that allows more variability in the use of multiple render windows, parallel data visualization and individual image selection for each render window.
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Description
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Merged this by merging the reviewed branch D175.
Known problems:
Some plugins try to get specific render windows (axial, sagittal, coronal) and immediately using an operation on that render window without checking if this render window is != nullptr. With the new multi widget editor these specific render windows might not be available and thus the call GetQmitkRenderWindow("axial") returns a nullptr (see also T25595 and T26376).
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The multi widget was was already introduced 2 years ago and used and tested inside the BlackSwan project.
We will continue working on this again and open a new meta-task for that purpose. Subtasks will be moved to the new meta-task and this task will be closed.