Jean-Marc Lasgouttes wrote: > What was the recipe that lead to a problem?
revert 1fa39e1f953434, create an equation array and enter \hline in any cell with the keyboard. This will produce a horizontal line, but undo does not work afterwards. If you only revert the undo group part of 1fa39e1f953434, and keep the changes in InsetMathGrid::interpretString(), undo will work, but two undo entries are produced (only the top of the undo stack will change somehing if executed). Georg
