EDIT

I think this is already in progress.

This is implemented. If a term is checked, which is also available in a tree, this node is checked as well and the other way round. Also for the buttons "select all children" and "select the subtree" it is implemented. Please review.

In most cases it works as expected. But loading the subareas does not work correctl. If I seclect e.g. Georgia and a subarea and e.g Caucasus and save. When reopening and removing Caucasus without opening the Georgia subtree the Georgian subarea after saving disappears from table. In case I open the subtree before saving second time it works as expected.

Andreas Müller wrote in #note-4:

In most cases it works as expected. But loading the subareas does not work correctl. If I seclect e.g. Georgia and a subarea and e.g Caucasus and save. When reopening and removing Caucasus without opening the Georgia subtree the Georgian subarea after saving disappears from table. In case I open the subtree before saving second time it works as expected.

The setCheckedElements for the viewer seems to quit the not visible elements therefore now the array of checked elements of the composite is used.
Please review.

Now when pressing the finish button a warning is shown "please check at least one item". Though these are checked - but not visible.

Andreas Müller wrote in #note-7:

Now when pressing the finish button a warning is shown "please check at least one item". Though these are checked - but not visible.

Ah, this is again because the treeViewer only knows about the visible checked elements... I adapted that.

And the size is adapted, too. Please review.

Now it works as expected.