Toggle Narrowing command
Summary
Sets or resets only the selection as editable area and makes the rest inaccessible.
Description
Sets or resets only the selection (whole logical lines including the selection) as editable area and make the rest inaccessible.
“Narrowing” function is only for one selection(one range)? If possible to use it while Multiple Selection Mode? In another word, “Multiple Selection Narrowing” exists or not?