In Bug #65837 I reported a symptom which was discussed for a while whether it is bug or it is not. The illustration file which I attached to that issue contains one row.
Recolouring that row changes the line height automatically (which seems to me a bug therefore I reported it originally). After this operation the Undo function works not perfectly.
Using the undo function reverses the colour change but it does not revert the automatic line height change. So the line becomes "automatic" background again but it's height remain changed.
This seems to be an other bug because Undo should turn back every changes. Not only the background color but the line height change too.
*** This bug has been marked as a duplicate of bug 65837 ***