Reveal to the current buffer in drawer style fern on BufEnter #114
Description
https://vim-jp.slack.com/archives/CQ57P4XU4/p1591941255294000
It sounds useful enough to implement such feature. Probably I'd apply some refactoring on the reveal feature and prepare function/command which is usable with :FernDo command introduced by #113
fyi @takets @yuki-ycino