Hi All,


Please review the fix for bug: 


Bug: JDK- 8175015 https://bugs.openjdk.java.net/browse/JDK-8175015


JDK 10 Webrev : http://cr.openjdk.java.net/~pkbalakr/Krishna/8175015/webrev00/



The bug reports about memory leak by repeatedly querying FileSystemView, if 
"C:\" is a root drive.


The problem is internally, Win32ShellFolderManager2.java, the function 
"isFileSystemRoot" is called, which lists the contents of all the root drives, 
in addition to including them. It also includes the hidden files. For each file 
present, it is wrapped with a "Win32ShellFolder2" object. So, for each query, 
it will list the files in the drives, and throws them away, which is leading to 
both memory consumption as well as slow performance. 


The fix is to use "Win32ShellFolder2.listRoots()", which is both fast and 
consumes less memory, since the number of drives on most systems will not 
exceed 5/10, whereas there can be a large number of files in the root 




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