Merge branch 'master' into terminal_strip

* master:
  BugFix : default element collection path is wrong
  snap: Remove framework snap prompt
  Update translation and add cn chinese ts files
  Danish translation updated
  Danish translation
  Danish translation
  Add new thumbnail element
  Flatpak add --share=network
Flatpak : add --socket=cups see :
https://github.com/flathub/org.libreoffice.LibreOffice/issues/90
  Graphics item handler is bigger when overred
  Add toolbar widget for edit size of handler in diagram editor.
  Fix Multiple translation in elements
  Fix Multiple translation in elements
  Fix segfault.
  new Analog-In - Module
  cleanup and upgraded elements
  modified:   lang/qet_nl.qm 	modified:   lang/qet_nl.ts
  Add Russian translation, thanks "А.Разживин"
  little modification in hungarian language
  Fixed typo

sources/utils/qetutils.h

@@ -21,7 +21,8 @@
 #include <QMargins>
 #include <QWeakPointer>
 
-class RealTerminal;
+class QGraphicsItem;
+
 /**
 	Provide some small utils function
 */
@@ -29,6 +30,7 @@ namespace QETUtils
 {
 	QString marginsToString(const QMargins &margins);
 	QMargins marginsFromString(const QString &string);
+	qreal graphicsHandlerSize(QGraphicsItem *item);
 
 	template <typename T>
 	QVector<QWeakPointer<T>> sharedVectorToWeak(const QVector<QSharedPointer<T>> &vector)