timeruler: add ability to resize markers and workarea

app/widget/timebased/timebasedviewselectionmanager.h

@@ -195,8 +195,26 @@ public:
     rational time_diff = view_->SceneToTimeNoGrid(view_->mapToScene(event->pos()).x() - drag_mouse_start_.x());
 
     // Snap points
+    rational presnap_time_diff = time_diff;
     SnapPoints(&time_diff);
 
+    // Validate snapping
+    if (Core::instance()->snapping() && view_->GetSnapService()) {
+      for (size_t i=0; i<selected_.size(); i++) {
+        rational proposed_time = dragging_.at(i) + time_diff;
+        T *sel = selected_.at(i);
+
+        if (sel->has_sibling_at_time(proposed_time)) {
+          // Unsnap
+          time_diff = presnap_time_diff;
+          if (view_->GetSnapService()) {
+            view_->GetSnapService()->HideSnaps();
+          }
+          break;
+        }
+      }
+    }
+
     // Validate movement
     for (size_t i=0; i<selected_.size(); i++) {
       rational proposed_time = dragging_.at(i) + time_diff;

app/widget/timebased/timebasedwidget.cpp

@@ -486,7 +486,7 @@ void TimeBasedWidget::SetPoint(Timeline::MovementMode m, const rational& time)
   }
 
   // Set workarea
-  command->add_child(new WorkareaSetRangeCommand(viewer_node_->project(), points, TimeRange(in_point, out_point)));
+  command->add_child(new WorkareaSetRangeCommand(points->workarea(), TimeRange(in_point, out_point)));
 
   Core::instance()->undo_stack()->push(command);
 }
@@ -511,7 +511,7 @@ void TimeBasedWidget::ResetPoint(Timeline::MovementMode m)
     r.set_out(TimelineWorkArea::kResetOut);
   }
 
-  Core::instance()->undo_stack()->push(new WorkareaSetRangeCommand(viewer_node_->project(), points, r));
+  Core::instance()->undo_stack()->push(new WorkareaSetRangeCommand(points->workarea(), r));
 }
 
 void TimeBasedWidget::PageScrollInternal(QScrollBar *bar, int maximum, int screen_position, bool whole_page_scroll)
@@ -772,6 +772,11 @@ bool TimeBasedWidget::SnapPoint(const std::vector<rational> &start_times, ration
     for (auto it=ruler()->GetTimelinePoints()->markers()->cbegin(); it!=ruler()->GetTimelinePoints()->markers()->cend(); it++) {
       TimelineMarker* m = *it;
 
+      // Ignore selected markers
+      if (std::find(ruler()->GetSelectedMarkers().cbegin(), ruler()->GetSelectedMarkers().cend(), m) != ruler()->GetSelectedMarkers().cend()) {
+        continue;
+      }
+
       qreal marker_pos = TimeToScene(m->time_range().in());
       AttemptSnap(potential_snaps, screen_pt, marker_pos, start_times, m->time_range().in());
 

app/widget/timebased/timebasedwidget.h

@@ -141,6 +141,7 @@ protected:
   virtual const QVector<Block*> *GetSnapBlocks() const { return nullptr; }
   virtual const QVector<KeyframeViewInputConnection*> *GetSnapKeyframes() const { return nullptr; }
   virtual const std::vector<NodeKeyframe*> *GetSnapIgnoreKeyframes() const { return nullptr; }
+  virtual const std::vector<TimelineMarker*> *GetSnapIgnoreMarkers() const { return nullptr; }
 
 protected slots:
   /**
@@ -164,8 +165,6 @@ signals:
   void ConnectedNodeChanged(ViewerOutput* old, ViewerOutput* now);
 
 private:
-
-
   /**
    * @brief Set either in or out point to the current playhead
    *