trackviewitem: receive signal when mute is changed from another source

app/node/output/track/track.cpp

@@ -44,6 +44,7 @@ TrackOutput::TrackOutput() :
 
   muted_input_ = new NodeInput("muted_in", NodeParam::kBoolean);
   muted_input_->set_is_keyframable(false);
+  connect(muted_input_, &NodeInput::ValueChanged, this, &TrackOutput::MutedInputValueChanged);
   AddInput(muted_input_);
 
   // Set default height
@@ -574,4 +575,9 @@ void TrackOutput::BlockLengthChanged()
   UpdateInOutFrom(index);
 }
 
+void TrackOutput::MutedInputValueChanged()
+{
+  emit MutedChanged(IsMuted());
+}
+
 OLIVE_NAMESPACE_EXIT

app/node/output/track/track.h

@@ -178,6 +178,11 @@ signals:
    */
   void TrackHeightChanged(int height);
 
+  /**
+   * @brief Signal emitted when the muted setting changes
+   */
+  void MutedChanged(bool e);
+
 protected:
 
 private:
@@ -214,6 +219,8 @@ private slots:
 
   void BlockLengthChanged();
 
+  void MutedInputValueChanged();
+
 };
 
 OLIVE_NAMESPACE_EXIT

app/widget/timelinewidget/trackview/trackviewitem.cpp

@@ -60,6 +60,8 @@ TrackViewItem::TrackViewItem(TrackOutput* track, QWidget *parent) :
   layout->addWidget(lock_button_);
 
   setMinimumHeight(mute_button_->height());
+
+  connect(track, &TrackOutput::MutedChanged, mute_button_, &QPushButton::setChecked);
 }
 
 QPushButton *TrackViewItem::CreateMSLButton(const QString& text, const QColor& checked_color) const