fix package installation. this method was removed it the API review, but it is actually required.

BUG:163290

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=817331

packagestructure.cpp

@@ -286,6 +286,7 @@ QStringList PackageStructure::mimetypes(const char* key) const
 void PackageStructure::setPath(const QString &path)
 {
     d->path = path;
+    pathChanged();
 }
 
 QString PackageStructure::path() const
@@ -293,6 +294,11 @@ QString PackageStructure::path() const
     return d->path;
 }
 
+void PackageStructure::pathChanged()
+{
+    // default impl does nothing, this is a hook for subclasses.
+}
+
 void PackageStructure::read(const KConfigBase *config)
 {
     d->contents.clear();

packagestructure.h

@@ -249,6 +249,12 @@ protected:
      */
     void setContentsPrefix(const QString &prefix);
 
+    /**
+     * Called whenever the path changes so that subclasses may take
+     * package specific actions.
+     */
+    virtual void pathChanged();
+
 private:
     class Private;
      Private * const d;