Related: #i123480# assure correct Undo/Redo with not shown tracked changes

(cherry picked from commit e8613c7e3b76a83d804d28199fdeacc6369569c6)

Conflicts:
	sw/source/core/doc/docedt.cxx
	sw/source/core/undo/undobj.cxx
	sw/source/core/undo/unredln.cxx

Change-Id: I45c25aa957995109b202e2130e5344b1bbb09669