Multiline edit is where you hold down the <ALT> keyboard button and mouse (left click) drag vertically and can insert, delete, cut, copy, paste a rectangular selection across multiple lines. From using the Aug 1st 2019 svn 11825 x64 bit version it seems all but the insert is incomplete. When you try to insert text using this method only the last selected line (highlighted line) gets the input, the vertical (multiline) select is lost when you enter any text.