Small fix in #4077 (Undo/redo reset listeners)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31784 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4080: adding inferred mrow (a quick solution is sometimes better than a perfect one)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31786 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4080: part of r31786 was not intended to belong to the commit

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31787 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e