[FIX] Changes added to fix sheet history diff(Green color) shown when the fields are not changed. Ref: http://dev.tiki.org/item4879

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48554 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] wysiwyg: Codemirror code breaking on tracker wysiwyg fields when there's an ItemLink field on the form with an "Add item..." option set (for some reason - hopefully fixes wish4206, thanks tolson)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48555 b456876b-0849-0410-b77d-98878d47e9d5