timeline: optimized rippling workarea, rippling to in/out, and the ripple tool

Use cache shift functionality introduced in previous commit to optimize
timeline usage.

app/node/output/track/track.cpp

@@ -244,10 +244,7 @@ const QList<Block *> &TrackOutput::Blocks() const
 void TrackOutput::InvalidateCache(const TimeRange &range, NodeInput *from, NodeInput *source)
 {
   if (block_invalidate_cache_stack_ == 0) {
-    if (queued_length_change_) {
-      queued_length_change_ = false;
-      SetLengthInternal(queued_length_);
-    }
+    PushLengthChangeSignal();
 
     Node::InvalidateCache(TimeRange(qMax(range.in(), rational(0)), qMin(range.out(), track_length())), from, source);
   }
@@ -437,6 +434,14 @@ void TrackOutput::Hash(QCryptographicHash &hash, const rational &time) const
   }
 }
 
+void TrackOutput::PushLengthChangeSignal()
+{
+  if (queued_length_change_) {
+    queued_length_change_ = false;
+    SetLengthInternal(queued_length_);
+  }
+}
+
 void TrackOutput::SetTrackName(const QString &name)
 {
   track_name_ = name;

app/node/output/track/track.h

@@ -193,6 +193,8 @@ public:
 
   virtual void Hash(QCryptographicHash& hash, const rational &time) const override;
 
+  void PushLengthChangeSignal();
+
 public slots:
   void SetTrackName(const QString& name);