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[mxn multi widget] Concept for blocking individual render windows
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Description

In order to make individual render windows unusable for specific user interaction a concept hast to be defined. The goal is to

  • block user interaction with individual render windows that do not fulfill specific conditions
  • allow to retrieve / report the "blocked" state of each render window

This is e.g. relevant for T29335: [Segmentation] Show interactive warning for uninitialized render window geometry, where the render windows should be blocker for mask drawing.
More relevant scenarios can be collected here.