fix(core): add missing dragging flag to nodes

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

packages/core/src/composables/useDrag.ts

@@ -132,6 +132,9 @@ function useDrag(params: UseDragParams) {
                     dragItems,
                     getNode: $$(getNode),
                   })
+
+                  dragging.value = true
+
                   onDrag(event.sourceEvent, currentNode, nodes)
                 }
               }
@@ -147,6 +150,9 @@ function useDrag(params: UseDragParams) {
                     dragItems,
                     getNode: $$(getNode),
                   })
+
+                  dragging.value = false
+
                   onStop(event.sourceEvent, currentNode, nodes)
                 }
               })