I just finished patching the Tags sidebar widget it now supports “No Tags“, As you can see here:
When you click on the “No Tags” radio button, the tags tree is disabled and all the images which have no tags are shown in the main view as shown here.
When you click on “Existing Tags” radio button, The tree is activated and the previously selected Tag album is set to the main view, as you can see in the following snapshot.
Wait that’s not all, Those features will be available in the next release of digiKam 4.2.0, and it’s so soon.
Ready to receive your feedback about it.