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	This PR adds a filetree to the left side of the files/diff view. Initially the filetree will not be shown and may be shown via a new "Show file tree" button. Showing and hiding is using the same icon as github. Folders are collapsible. On small devices (max-width 991 PX) the file tree will be hidden. Close #18192 Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>