Github user martincgg commented on the pull request:
https://github.com/apache/cordova-plugin-file/pull/65#issuecomment-49847041
Given some of the variations on valid paths for Windows Phone, when a
single '/' , '/dir//someDir and '///someDir' are valid paths, however a
'/someDir' is not.
However when the native side always returns a fileEntry as '//someDir or
//someFile.ext, the double slash at the beginning it makes difficult to make a
combination to get the full path and resolve a relative path(Path.GetFullPath),
ignoring completely the two points in the path('..'), when more than one slash
is present at the beginning of the string parent path.
The RemoveExtraSlash, is a recursive function that removes the extra
slashes from the beginning of the parent path, returning a proper path in order
to be combined and resolved to an absolute path.
The Path.GetFullPath it always returns a full path with a drive letter,
which it will be replaced by the double slash to make it a valid path.
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