The wasted space on the left is because now tags can have subtags (just drag-n-drop a tag onto another). This is an expandable gtkTreeView and I don't think there's a way to get rid of that space.
The wasted space on the left is because now tags can have subtags (just drag-n-drop a tag onto another). This is an expandable gtkTreeView and I don't think there's a way to get rid of that space.