Update grip anchor lines on edit

Author: mike-spa

src/notation/internal/notationinteraction.cpp

@@ -4844,6 +4844,9 @@ void NotationInteraction::editElement(QKeyEvent* event)
             m_editData.element = bracket;
             select({ bracket }, SelectType::SINGLE);
         }
+        if (isGripEditStarted()) {
+            updateGripAnchorLines();
+        }
 
         apply();
     } else {