Folks - see my recent solution The quickest and easiest ever todolist in tiddlywiki ? Requires 5.2.0 - #2 by TW_Tones for an example of why we could use a way to programaticaly hide the body, in this example I provide a fold button as the work around.
Also @Mohammad see inside quicklist for a method I employed to simply parse the lines similar to Section Editor - Prototype it may prove of use in the future.