optimize QDir::cd()

We already create a file engine for testing if dir exists. We can also
use it as source for current QDir.

Merge-request: 445
Reviewed-by: João Abecasis <joao@trolltech.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/src/corelib/io/qdir.cpp b/src/corelib/io/qdir.cpp
index 3a04920..eb02e6c 100644
--- a/src/corelib/io/qdir.cpp
+++ b/src/corelib/io/qdir.cpp
@@ -929,14 +929,13 @@ bool QDir::cd(const QString &dirName)
             }
         }
     }
-    {
-        QFileInfo fi(newPath);
-        if (!(fi.exists() && fi.isDir()))
-            return false;
-    }
 
-    d->setPath(newPath);
-    refresh();
+    QDir dir(*this);
+    dir.setPath(newPath);
+    if (!dir.exists())
+        return false;
+
+    *this = dir;
     return true;
 }