add mouseMove signal to SignalLabel

Make use of the mouseMove signal in SplitHeader for the stream uptime
tooltip

src/widgets/helper/signallabel.cpp

@@ -30,5 +30,6 @@ void SignalLabel::mouseReleaseEvent(QMouseEvent *event)
 
 void SignalLabel::mouseMoveEvent(QMouseEvent *event)
 {
+    emit this->mouseMove(event);
     event->ignore();
 }

src/widgets/helper/signallabel.hpp

@@ -18,6 +18,7 @@ signals:
 
     void mouseDown();
     void mouseUp();
+    void mouseMove(QMouseEvent *event);
 
 protected:
     void mouseDoubleClickEvent(QMouseEvent *ev) override;

src/widgets/helper/splitheader.cpp

@@ -57,6 +57,7 @@ SplitHeader::SplitHeader(Split *_split)
         title->setMouseTracking(true);
         QObject::connect(this->titleLabel, &SignalLabel::mouseDoubleClick, this,
                          &SplitHeader::mouseDoubleClickEvent);
+        QObject::connect(this->titleLabel, &SignalLabel::mouseMove, this, &SplitHeader::mouseMoveEvent);
 
         layout->addStretch(1);