Version: (using KDE KDE 3.4.1) Installed from: Mac OS X (Fink) Packages 1: Press Ctrl + Alt + N. The first tag appears. 2: Undo. The tag disappears. 3: Press Ctrl + Alt + N. The second tag appears. The first tag should have appeared again, not the second one.
This will be very hard to fix and I'm not sure if it's worth it. Undo basically works on the text changes, does not follow the overall status of the editor.
tag inserting feature is implemented in different way in kaider, so the problem can't arise in it.