Jump to Dired buffer corresponding to current buffer. If in a file, Dired the current directory and move to file’s line. If in Dired already, pop up a level and goto old directory’s line. In case the proper Dired file line cannot be found, refresh the dired buffer and try again.
今のバッファのdiredに飛ぶ。一応C-x C-jを割り当てている。
