Don't hardcode project display ratio for timeline thumbs

src/timeline2/view/qml/ClipThumbs.qml

@@ -9,7 +9,7 @@ Row {
     anchors.fill: parent
     visible: !isAudio
     opacity: clipStatus == ClipState.Disabled ? 0.2 : 1
-    property int thumbWidth: container.height * 16.0/9.0
+    property int thumbWidth: container.height * root.dar
     property bool enableCache: clipRoot.itemType == ProducerType.Video || clipRoot.itemType == ProducerType.AV
 
     function reload() {

src/timeline2/view/qml/timeline.qml

@@ -257,6 +257,7 @@ Rectangle {
     property bool seekingFinished : proxy.seekFinished
     property int scrollMin: scrollView.flickableItem.contentX / timeline.scaleFactor
     property int scrollMax: scrollMin + scrollView.viewport.width / timeline.scaleFactor
+    property double dar: 16/9
 
     onSeekingFinishedChanged : {
         playhead.opacity = seekingFinished ? 1 : 0.5

src/timeline2/view/timelinewidget.cpp

@@ -139,6 +139,7 @@ void TimelineWidget::setModel(const std::shared_ptr<TimelineItemModel> &model, M
     connect(rootObject(), SIGNAL(zoomOut(bool)), pCore->window(), SLOT(slotZoomOut(bool)));
     connect(rootObject(), SIGNAL(processingDrag(bool)), pCore->window(), SIGNAL(enableUndo(bool)));
     connect(m_proxy, &TimelineController::seeked, proxy, &MonitorProxy::setPosition);
+    rootObject()->setProperty("dar", pCore->getCurrentDar());
     m_proxy->setRoot(rootObject());
     setVisible(true);
     loading = false;