GUI: Element selection based on VTK-Filters
In current OGS Versions you can select mesh elements in the GUI and get certain information for the selected element such as ID, nodes, volume, etc. However, using this implementation the functionality is not available if you select the elements on filters applied to meshes. This would be very useful, however ... or rather, it would be very useful for the vtkThreshold-filter specifically. (I.e. you might select a subset of elements with bad quality or specific physical properties and cound then see element properties by selecting one specific element).
The solutiion is not straighforward as the threshold filter renumbers element-IDs. Also it is not quite clear for which filters this functinality should work (e.g. for contour-filters it makes absolutely no sense as the elements of the UGrid of the filter result have no direct relation to the orginal mesh elements.