take theme name also from the shell package if avail

the look and feel package still wins.
tough for applications is the shell that sets it

shell/main.cpp

@@ -132,8 +132,7 @@ int main(int argc, char *argv[])
     if (cliOptions.isSet(standaloneOption) && cliOptions.isSet(shellPluginOption)) {
         ShellManager::s_standaloneOption = true;
         app.setApplicationName("plasmashell_"+cliOptions.value(shellPluginOption));
-        Plasma::Theme theme;
-        theme.setUseGlobalSettings(false);
+
         KDBusService service(KDBusService::Unique);
         StandaloneAppCorona corona(cliOptions.value(shellPluginOption));
         return app.exec();

shell/shellcorona.cpp

@@ -124,28 +124,6 @@ ShellCorona::ShellCorona(QObject *parent)
         saveLayout();
     });
 
-    const QString themeGroupKey = QStringLiteral("Theme");
-    const QString themeNameKey = QStringLiteral("name");
-
-    QString themeName;
-
-    KConfigGroup plasmarc(KSharedConfig::openConfig("plasmarc"), themeGroupKey);
-    themeName = plasmarc.readEntry(themeNameKey, themeName);
-
-    if (themeName.isEmpty()) {
-        KConfigGroup lnfCfg = KConfigGroup(KSharedConfig::openConfig(
-                                                m_lookAndFeelPackage.filePath("defaults")),
-                                                "plasmarc"
-                                           );
-        lnfCfg = KConfigGroup(&lnfCfg, themeGroupKey);
-        themeName = lnfCfg.readEntry(themeNameKey, themeName);
-    }
-
-    if (!themeName.isEmpty()) {
-        Plasma::Theme *t = new Plasma::Theme(this);
-        t->setThemeName(themeName);
-    }
-
     connect(this, &ShellCorona::containmentAdded,
             this, &ShellCorona::handleContainmentAdded);
 
@@ -208,6 +186,31 @@ void ShellCorona::setShell(const QString &shell)
     setPackage(package);
     m_desktopDefaultsConfig = KConfigGroup(KSharedConfig::openConfig(package.filePath("defaults")), "Desktop");
 
+        const QString themeGroupKey = QStringLiteral("Theme");
+    const QString themeNameKey = QStringLiteral("name");
+
+    QString themeName;
+
+    KConfigGroup plasmarc(KSharedConfig::openConfig("plasmarc"), themeGroupKey);
+    themeName = plasmarc.readEntry(themeNameKey, themeName);
+
+    if (themeName.isEmpty()) {
+        KConfigGroup shellCfg = KConfigGroup(KSharedConfig::openConfig(package.filePath("defaults")), "Theme");
+
+        themeName = shellCfg.readEntry("name", "default");
+        KConfigGroup lnfCfg = KConfigGroup(KSharedConfig::openConfig(
+                                                m_lookAndFeelPackage.filePath("defaults")),
+                                                "plasmarc"
+                                           );
+        lnfCfg = KConfigGroup(&lnfCfg, themeGroupKey);
+        themeName = lnfCfg.readEntry(themeNameKey, themeName);
+    }
+
+    if (!themeName.isEmpty()) {
+        Plasma::Theme *t = new Plasma::Theme(this);
+        t->setThemeName(themeName);
+    }
+
     //FIXME: this would change the runtime platform to a fixed one if available
     // but a different way to load platform specific components is needed beforehand
     // because if we import and use two different components plugin, the second time

shell/standaloneappcorona.cpp

@@ -44,6 +44,12 @@ StandaloneAppCorona::StandaloneAppCorona(const QString &coronaPlugin, QObject *p
     package.setPath(m_coronaPlugin);
     setPackage(package);
 
+    Plasma::Theme theme;
+    theme.setUseGlobalSettings(false);
+
+    KConfigGroup lnfCfg = KConfigGroup(KSharedConfig::openConfig(package.filePath("defaults")), "Theme");
+    theme.setThemeName(lnfCfg.readEntry("name", "default"));
+
     m_desktopDefaultsConfig = KConfigGroup(KSharedConfig::openConfig(package.filePath("defaults")), "Desktop");
 
     connect(m_activityConsumer, SIGNAL(currentActivityChanged(QString)), this, SLOT(currentActivityChanged(QString)));