Fix video loading from file

- Added an overload for setMatrix in UBGraphicsMediaItem, to propagate
  matrix changes to the child videoItem
- Upon loading a video, the child videoItem is now added correctly, and
  set to the right position

src/adaptors/UBSvgSubsetAdaptor.cpp

@@ -31,6 +31,7 @@
 #include <QtXml>
 #include <QGraphicsTextItem>
 #include <QDomElement>
+#include <QGraphicsVideoItem>
 
 #include "domain/UBGraphicsSvgItem.h"
 #include "domain/UBGraphicsPixmapItem.h"
@@ -652,6 +653,10 @@ UBGraphicsScene* UBSvgSubsetAdaptor::UBSvgSubsetReader::loadScene()
                     videoItem->setFlag(QGraphicsItem::ItemIsSelectable, true);
 
                     mScene->addItem(videoItem);
+                    mScene->addItem(videoItem->videoItem());
+
+                    // Update the child QGraphicsVideoItem's transformation matrix
+                    videoItem->setMatrix(videoItem->matrix());
 
                     videoItem->show();
 

src/domain/UBGraphicsMediaItem.cpp

@@ -353,6 +353,13 @@ void UBGraphicsMediaItem::setPos(qreal x, qreal y)
     setPos(QPointF(x, y));
 }
 
+void UBGraphicsMediaItem::setMatrix(const QMatrix &matrix, bool combine)
+{
+    QGraphicsItem::setMatrix(matrix, combine);
+
+    if (mVideoItem)
+        mVideoItem->setMatrix(matrix, combine);
+}
 
 void UBGraphicsMediaItem::setTransform(const QTransform &matrix, bool combine)
 {

src/domain/UBGraphicsMediaItem.h

@@ -110,6 +110,7 @@ public:
 
     virtual void setPos(const QPointF &pos);
     virtual void setPos(qreal x, qreal y);
+    virtual void setMatrix(const QMatrix &matrix, bool combine = false);
     virtual void setTransform(const QTransform &matrix, bool combine = false);
     virtual void resize(qreal w, qreal h);
     virtual void resize(const QSizeF & pSize);