mono/mono — pull request #1018 by ermshiperete (2014-05-06 17:11:13+00:00)
Title: [MWF] Clear currentCell before disposing (fixes #19567)

If currentCell still has a value when we call Columns.Clear() we might try to end the editing. Because the columns got disposed before calling Columns.Clear() we get a crash. This patch fixes the problem by setting currentCell to null before disposing the columns.