avoid unnecessary copies by using const & in foreach

svn path=/trunk/KDE/kdebase/apps/konsole/; revision=800783

src/ShellCommand.cpp

@@ -93,7 +93,7 @@ QStringList ShellCommand::expand(const QStringList& items)
 {
     QStringList result;
 
-    foreach( QString item , items )
+    foreach( const QString &item , items )
         result << expand(item);
 
     return result;