diff --git a/applets/kicker/plugin/actionlist.cpp b/applets/kicker/plugin/actionlist.cpp
--- a/applets/kicker/plugin/actionlist.cpp
+++ b/applets/kicker/plugin/actionlist.cpp
@@ -251,7 +251,10 @@
     resultIt = results.begin();
 
     while (list.count() < 6 && resultIt != results.end()) {
-        const QString resource = (*resultIt).resource();
+        QString resource = (*resultIt).resource();
+        if (QDir::isAbsolutePath(resource)) {
+            resource = QUrl::fromLocalFile(resource).toString();
+        }
         ++resultIt;
 
         const QUrl url(resource);
diff --git a/applets/kicker/plugin/kastatsfavoritesmodel.cpp b/applets/kicker/plugin/kastatsfavoritesmodel.cpp
--- a/applets/kicker/plugin/kastatsfavoritesmodel.cpp
+++ b/applets/kicker/plugin/kastatsfavoritesmodel.cpp
@@ -28,6 +28,7 @@
 #include <QFileInfo>
 #include <QTimer>
 #include <QSortFilterProxyModel>
+#include <QDir>
 
 #include <KLocalizedString>
 #include <KSharedConfig>
@@ -158,7 +159,7 @@
             return SP(new ContactEntry(q, resource));
 
         } else if (agent == AGENT_DOCUMENTS) {
-            if (resource.startsWith(QLatin1String("/"))) {
+            if (QDir::isAbsolutePath(resource)) {
                 return SP(new FileEntry(q, QUrl::fromLocalFile(resource)));
             } else {
                 return SP(new FileEntry(q, QUrl(resource)));
@@ -271,7 +272,7 @@
     {
         // We want even files to have a proper URL
         const auto resource =
-            _resource.startsWith(QLatin1Char('/')) ? QUrl::fromLocalFile(_resource).toString() : _resource;
+            QDir::isAbsolutePath(_resource) ? QUrl::fromLocalFile(_resource).toString() : _resource;
 
         qCDebug(KICKER_DEBUG) << "Adding result" << resource << "already present?" << m_itemEntries.contains(resource);
 
diff --git a/applets/taskmanager/plugin/backend.cpp b/applets/taskmanager/plugin/backend.cpp
--- a/applets/taskmanager/plugin/backend.cpp
+++ b/applets/taskmanager/plugin/backend.cpp
@@ -39,6 +39,7 @@
 #include <QQuickWindow>
 #include <QVersionNumber>
 #include <QTimer>
+#include <QDir>
 
 #include <KActivities/Consumer>
 #include <KActivities/Stats/Cleaning>
@@ -318,7 +319,10 @@
     int actionCount = 0;
 
     while (actionCount < 5 && resultIt != results.end()) {
-        const QString resource = (*resultIt).resource();
+        QString resource = (*resultIt).resource();
+        if (QDir::isAbsolutePath(resource)) {
+            resource = QUrl::fromLocalFile(resource).toString();
+        }
         ++resultIt;
 
         const QUrl url(resource);
diff --git a/kcms/desktoptheme/kcm.cpp b/kcms/desktoptheme/kcm.cpp
--- a/kcms/desktoptheme/kcm.cpp
+++ b/kcms/desktoptheme/kcm.cpp
@@ -52,10 +52,6 @@
     , m_defaultTheme(new Plasma::Theme(this))
     , m_haveThemeExplorerInstalled(false)
 {
-    //This flag seems to be needed in order for QQuickWidget to work
-    //see https://bugreports.qt-project.org/browse/QTBUG-40765
-    //also, it seems to work only if set in the kcm, not in the systemsettings' main
-    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
     qmlRegisterType<QStandardItemModel>();
 
     KAboutData* about = new KAboutData(QStringLiteral("kcm_desktoptheme"), i18n("Plasma Style"),
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -468,7 +468,6 @@
     : KQuickAddons::ConfigModule(parent, args)
     , m_fontAASettings(new FontAASettings(this))
 {
-    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
     KAboutData* about = new KAboutData("kcm_fonts", i18n("Fonts"),
                                        "0.1", QString(), KAboutLicense::LGPL);
     about->addAuthor(i18n("Antonis Tsiapaliokas"), QString(), "antonis.tsiapaliokas@kde.org");
diff --git a/kcms/lookandfeel/kcm.cpp b/kcms/lookandfeel/kcm.cpp
--- a/kcms/lookandfeel/kcm.cpp
+++ b/kcms/lookandfeel/kcm.cpp
@@ -67,10 +67,6 @@
     , m_resetDefaultLayout(false)
     , m_applyWindowDecoration(true)
 {
-    //This flag seems to be needed in order for QQuickWidget to work
-    //see https://bugreports.qt-project.org/browse/QTBUG-40765
-    //also, it seems to work only if set in the kcm, not in the systemsettings' main
-    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
     qmlRegisterType<QStandardItemModel>();
     qmlRegisterType<KCMLookandFeel>();
     KAboutData* about = new KAboutData(QStringLiteral("kcm_lookandfeel"), i18n("Global Theme"),