UI: TimingLine: only send update information to AssLinesModel

No need to send content change as AssLinesModel retrieves it from the
LinePtr

src/UI/DocumentViews/AssLinesModel.cc

@@ -156,7 +156,7 @@ AssLinesModel::flags(const QModelIndex &index) const noexcept
 }
 
 void
-AssLinesModel::updateLine(int lineIndex, Ass::LinePtr line)
+AssLinesModel::updateLine(int lineIndex)
 {
-    setData(index(lineIndex, 0), QVariant::fromValue(line), Qt::DisplayRole);
+    emit dataChanged(index(lineIndex, 0), index(lineIndex, 0));
 }

src/UI/DocumentViews/AssLinesModel.hh

@@ -57,6 +57,6 @@ private:
     const QVector<Ass::LinePtr> &lineRealData;
 
 public slots:
-    void updateLine(int, Ass::LinePtr);
+    void updateLine(int);
 };
 }

src/UI/DocumentViews/AudioVisualizer/TimingLine.cc

@@ -164,9 +164,7 @@ TimingLine::requestMove(int sepIndex, qreal x)
 
     line.setContent(syls);
 
-    if (given) {
-        emit lineChanged(lineIndex, std::make_shared<Ass::Line>(line));
-    }
+    emit lineChanged(lineIndex);
 
     return given;
 }

src/UI/DocumentViews/AudioVisualizer/TimingLine.hh

@@ -28,7 +28,7 @@ public:
     qreal requestMove(int, qreal);
 
 signals:
-    void lineChanged(int, Ass::LinePtr);
+    void lineChanged(int);
 
 public slots:
     void timingSeparatorHasChanged(int, qreal);