Backward compatible ifdefs for Qt Version

Core/PluginLoader.cc

@@ -316,9 +316,12 @@ void Core::loadPlugins()
    * Remove static plugins from dynamically loaded list.
    */
   {
-      QStringList list = QString::fromUtf8(cmake::static_plugins).split("\n");
-      // This warning couöld be fixed when the minimal Qt Version is >= 5.14
-      QSet<QString> staticPlugins = QSet<QString>::fromList(list);
+      QStringList list = QString::fromUtf8(cmake::static_plugins).split("\n");      
+      #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+         QSet<QString> staticPlugins = QSet<QString>(list.begin(),list.end());
+      #else
+         QSet<QString> staticPlugins = QSet<QString>::fromList(list);
+      #endif
       for (int i = 0; i < pluginlist.size(); ) {
           const QString bn = QFileInfo(pluginlist[i]).fileName();
           if (staticPlugins.contains(bn)) {

widgets/coreWidget/viewerControl.cc

@@ -504,11 +504,14 @@ void CoreWidget::applicationSnapshotDialog() {
     OpenFlipperSettings().setValue("Core/CurrentDir", QFileInfo(newName).absolutePath() );
       
     snapshotName_ = newName;
-
     dialog.hide();
 
-    QScreen* screen = window()->screen();
-    QPixmap pic = screen->grabWindow( winId() );
+    #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+      QScreen* screen = window()->screen();
+      QPixmap pic = screen->grabWindow( winId() );
+    #else
+      QPixmap pic = QPixmap::grabWindow( winId() );
+    #endif
 
     QPainter painter (&pic);
 
@@ -535,8 +538,13 @@ void CoreWidget::applicationSnapshotDialog() {
 
 ///Take a snapshot of the whole application
 void CoreWidget::applicationSnapshot() {
-  QScreen* screen = window()->screen();
-  QPixmap pix = screen->grabWindow( winId() );
+
+  #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    QScreen* screen = window()->screen();
+    QPixmap pix = screen->grabWindow( winId() );
+  #else
+    QPixmap pix = QPixmap::grabWindow( winId() ).
+  #endif
 
   // Write image asynchronously
   QImage* pic = new QImage(pix.toImage());