add work with key cache

fix bug with invalid dataengine settings in UI

sources/desktop-panel-kf5/package/metadata.desktop

@@ -0,0 +1,28 @@
+[Desktop Entry]
+Encoding=UTF-8
+Name=Desktop Panel
+Comment=A minimalistic Plasmoid
+Comment[en]=A minimalistic Plasmoid
+Comment[es]=Un plasmoide minimalista
+Comment[es]=Un script Plasmoïde minimaliste
+Comment[pt_BR]=Um script Plasmoid
+Comment[ru]=Минималистичный плазмоид
+Comment[uk]=Мінімалістичний плазмоїд
+X-KDE-ServiceTypes=Plasma/Applet
+Type=Service
+Icon=utilities-system-monitor
+
+X-KDE-ServiceTypes=Plasma/Applet
+X-Plasma-API=declarativeappletscript
+X-Plasma-MainScript=ui/main.qml
+X-Plasma-RemoteLocation=
+
+X-KDE-PluginInfo-Author=Evgeniy Alekseev aka arcanis
+X-KDE-PluginInfo-Email=esalexeev@gmail.com
+X-KDE-PluginInfo-Name=org.kde.plasma.desktoppanel
+X-KDE-PluginInfo-Version=2.2.2
+X-KDE-PluginInfo-Website=http://arcanis.name/projects/awesome-widgets/
+X-KDE-PluginInfo-Category=System Information
+X-KDE-PluginInfo-Depends=
+X-KDE-PluginInfo-License=GPLv3
+X-KDE-PluginInfo-EnabledByDefault=true