PowerLanguage Editor LineOut Feature

Some professional editors have the following feature:
If you mark Code (several lines) in the Editor, it appears a little triangle next to the first marked line (see pic1). If you click on that triangle the marked code collapses to just the first line, which should be a comment (see pic2) and shows bold or otherwise distinguished. The line numbers count still like the code was not collapsed. A click on the triangle again uncollapses the code and hovering the mouse pointer over the  first line shows the content (see pic3).
This makes complex code much more readable and fun to work with as you would collapse code parts that are tested out and finished so you only see the parts you are working on.
Please vote for this feature request.