In order to share different crosshairs (crosshair positions) between individual render windows a new concept needs to be defined.
The scenarios are:
- if render windows show different data / have different camera views on an image but the clicked / focused position of render window A should be visible in render window B
- could simplify T29393: [mxn multi widget] Concept for individual render window synchronization, if synchronized render windows do either
- only need to show the same / a single crosshair
- need to use the same data / information for synchronized crosshairs