fix

src/components/Canvas/FlowCanvas/manager/EventManager.ts

@@ -56,7 +56,7 @@ export class EventManager {
 	mousemove_:any
 	/** 处理鼠标中间点击 */
 	mousedown(event:any) {
-		if (event.button === 1) {
+		if (event.button === 1 && !event.target.classList.contains('dragging')) {
 			this.vueFlowPosition = this.vueFlow.value.getTransform()
 			event.target.classList.add('dragging')
 			this.originalPosition = {