Directory tree navigation is broken because of directory signs which is
shown in UTF-8.
Cygwin is a Windows application, so it uses ASCII codepages and so
directory signs must be in ASCII, but if to modify
"nerdtree#runningWindows" function there are many other functions break
that convert paths, e.g.
So, the quick and reliable solution is to add a
separate function "nerdtree#runningCygwin" and use it in a specific
place.
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