Automatically constrain arc or rectangle points.

CHANGELOG.md

@@ -20,6 +20,8 @@ New sketch features:
     the entity from a request is selected. For example, dragging a point on
     a face of an extrusion coincident with the source sketch plane will
     drag the point from the source sketch.
+  * When dragging an arc or rectangle point, it will be automatically
+    constrained to other points with a click.
 
 New export/import features:
   * Three.js: allow configuring projection for exported model, and initially

src/mouse.cpp

@@ -1108,11 +1108,10 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
             break;
 
         case Pending::DRAGGING_RADIUS:
-        case Pending::DRAGGING_NEW_POINT:
-            // The MouseMoved event has already dragged it as desired.
             ClearPending();
             break;
 
+        case Pending::DRAGGING_NEW_POINT:
         case Pending::DRAGGING_NEW_ARC_POINT:
             ConstrainPointByHovered(pending.point);
             ClearPending();