<F4> fails if $EDITOR includes space

[step-]

Line 136

notes/tmt

Line 136 in b8a2bc7

${EDITOR:-vim} $FILE "+/\\M$line" ;;

fails to run if EDITOR includes a space because line 4

notes/tmt

Line 4 in b8a2bc7

IFS=$'\n\t'

prevents word expansion on the space character.

E.g. Here EDITOR='gvim -f' fails with message: gvim -f: no such file or directory.