Stop PathFilter after walking all matching paths

After the current path of the TreeWalk is no longer a prefix of the
PathFilter's path, there can be no more matching entries, but TreeWalk
will happily keep walking the rest of a (potentially very large and
recursive) tree unless StopWalkException is thrown. So, throw
StopWalkException from PathFilter.include() at the earliest
opportunity.

Change-Id: If6c4f395a3d5ed5b71bf68de23be9f2b0620e7f1

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/filter/PathFilter.java

@@ -44,6 +44,7 @@
 
 package org.eclipse.jgit.treewalk.filter;
 
+import org.eclipse.jgit.errors.StopWalkException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.treewalk.TreeWalk;
@@ -97,7 +98,10 @@ public class PathFilter extends TreeFilter {
 
 	@Override
 	public boolean include(final TreeWalk walker) {
-		return walker.isPathPrefix(pathRaw, pathRaw.length) == 0;
+		int cmp = walker.isPathPrefix(pathRaw, pathRaw.length);
+		if (cmp > 0)
+			throw StopWalkException.INSTANCE;
+		return cmp == 0;
 	}
 
 	@Override