nodes: rewrote and simplified length signaling system

app/task/precache/precachetask.cpp

@@ -57,13 +57,18 @@ PreCacheTask::~PreCacheTask()
 bool PreCacheTask::Run()
 {
   // Get list of invalidated ranges
-  TimeRangeList video_range = viewer()->video_frame_cache()->GetInvalidatedRanges();
+  TimeRange intersection;
 
-  // If we're caching only in-out, limit the range to that
   if (footage_->GetTimelinePoints()->workarea()->enabled()) {
-    video_range = video_range.Intersects(footage_->GetTimelinePoints()->workarea()->range());
+    // If we're caching only in-out, limit the range to that
+    intersection = footage_->GetTimelinePoints()->workarea()->range();
+  } else {
+    // Otherwise use full length
+    intersection = TimeRange(0, footage_->GetVideoLength());
   }
 
+  TimeRangeList video_range = viewer()->video_frame_cache()->GetInvalidatedRanges(intersection);
+
   Render(project_->color_manager(),
          video_range,
          TimeRangeList(),