skip applets not in formfactor

applets without a formfactor are always listed
if a formfactor is not specified, list everything

components/shellprivate/CMakeLists.txt

@@ -33,6 +33,7 @@ target_link_libraries(plasmashellprivateplugin
         KF5::NewStuff
         KF5::KIOFileWidgets
         KF5::WindowSystem
+        KF5::Declarative
 )
 
 if (KF5TextEditor_FOUND)

components/shellprivate/widgetexplorer/plasmaappletitemmodel.cpp

@@ -29,6 +29,7 @@
 #include "config-workspace.h"
 #include <KPluginTrader>
 #include <KPackage/PackageLoader>
+#include <KDeclarative/KDeclarative>
 
 PlasmaAppletItem::PlasmaAppletItem(PlasmaAppletItemModel *model,
                                    const KPluginInfo& info,
@@ -299,6 +300,18 @@ void PlasmaAppletItemModel::populateModel(const QStringList &whatChanged)
             continue;
         }
 
+        bool inFormFactor = true;
+
+        foreach (const QString &formFactor, KDeclarative::KDeclarative::runtimePlatform()) {
+            if (!info.formFactors().isEmpty() &&
+                !info.formFactors().contains(formFactor)) {
+                inFormFactor = false;
+            }
+        }
+        if (!inFormFactor) {
+            continue;
+        }
+
         //qDebug() << info.pluginName() << " is the name of the plugin at" << info.entryPath();
         //qDebug() << info.name() << info.property("X-Plasma-Thumbnail");