SVNKIT-691: SVNDiffClient#doPatch didn't work correctly on Windows, n…

…ow fixed.

The problem was in the "SvnPatchTarget.isUnderRoot()" method:
"workingCopyDirectoryPath" var contains forward slashes
while the "canonicalFullPath" contains backslashes - therefore the check
always returned false.

Patch by Martin Ehrnhoefer.

svnkit/src/main/java/org/tmatesoft/svn/core/internal/wc2/patch/SvnPatchTarget.java

@@ -709,7 +709,7 @@ private static boolean isUnderRoot(File workingCopyDirectory, File relPath) thro
         File fullPath = SVNFileUtil.createFilePath(workingCopyDirectory, relPath);
         try {
             String workingCopyDirectoryPath = SVNFileUtil.getFilePath(workingCopyDirectory.getCanonicalFile());
-            String canonicalFullPath = fullPath.getCanonicalPath();
+            String canonicalFullPath = SVNFileUtil.getFilePath(fullPath.getCanonicalFile());
             return canonicalFullPath.equals(workingCopyDirectoryPath) || SVNPathUtil.isAncestor(workingCopyDirectoryPath, canonicalFullPath);
         } catch (IOException e) {
             SVNErrorMessage errorMessage = SVNErrorMessage.create(SVNErrorCode.IO_ERROR, e);