audiowaveformview: limit to audio length

Fixes potential infinite loop.

app/widget/viewer/audiowaveformview.cpp

@@ -110,8 +110,11 @@ void AudioWaveformView::paintEvent(QPaintEvent *event)
   p.drawLine(playhead_x, 0, playhead_x, height());
 }
 
-void AudioWaveformView::RenderRange(const TimeRange &range)
+void AudioWaveformView::RenderRange(TimeRange range)
 {
+  // Limit range to length
+  range = TimeRange(qMax(rational(0), range.in()), qMin(playback_->GetLength(), range.out()));
+
   // Floor to second increments
   int64_t start = qFloor(range.in().toDouble());
   int64_t end = qCeil(range.out().toDouble());

app/widget/viewer/audiowaveformview.h

@@ -50,7 +50,7 @@ protected:
   virtual void paintEvent(QPaintEvent* event) override;
 
 private:
-  void RenderRange(const TimeRange& range);
+  void RenderRange(TimeRange range);
 
   QThreadPool pool_;