add a way for the shell package views to access files from the kpackage

shell/desktopview.cpp

@@ -218,6 +218,11 @@ QVariantMap DesktopView::candidateContainmentsGraphicItems() const
     return map;
 }
 
+Q_INVOKABLE QString DesktopView::fileFromPackage(const QString &key, const QString &fileName)
+{
+    return corona()->kPackage().filePath(key.toUtf8(), fileName);
+}
+
 bool DesktopView::event(QEvent *e)
 {
     if (e->type() == QEvent::PlatformSurface) {

shell/desktopview.h

@@ -77,6 +77,8 @@ public:
 
     QVariantMap candidateContainmentsGraphicItems() const;
 
+    Q_INVOKABLE QString fileFromPackage(const QString &key, const QString &fileName);
+
 protected:
     bool event(QEvent *e) override;
     void keyPressEvent(QKeyEvent *e) override;

shell/panelview.cpp

@@ -164,6 +164,11 @@ KConfigGroup PanelView::configDefaults() const
     return panelConfigDefaults(m_corona, containment(), m_screenToFollow);
 }
 
+Q_INVOKABLE QString PanelView::fileFromPackage(const QString &key, const QString &fileName)
+{
+    return corona()->kPackage().filePath(key.toUtf8(), fileName);
+}
+
 void PanelView::maximize()
 {
     int length;

shell/panelview.h

@@ -116,6 +116,7 @@ public:
     KConfigGroup config() const override;
     KConfigGroup configDefaults() const;
 
+    Q_INVOKABLE QString fileFromPackage(const QString &key, const QString &fileName);
     Q_INVOKABLE void maximize();
 
     Qt::Alignment alignment() const;