fix(carousel): fix navigate to current item (#302)

* fix(carousel): fix carousel click triggering button bug

* Apply suggestions from code review

Co-authored-by: 07akioni <07akioni2@gmail.com>

CHANGELOG.en-US.md

@@ -16,6 +16,7 @@
 
 - Fix `n-date-picker` `n-provider` pass `date-locale` not work, closes [#250](https://github.com/TuSimple/naive-ui/issues/250).
 - Fix `n-input` clear button placeholder prevent clicking on actual component [#288](https://github.com/TuSimple/naive-ui/issues/288)
+- Fix `n-carousel` click the at current item button, the component behaves abnormally.
 
 ## 2.14.0 (2021-06-23)
 

CHANGELOG.zh-CN.md

@@ -16,6 +16,7 @@
 
 - 修复 `n-date-picker` `n-provider` 传递 `date-locale` 属性无效，关闭 [#250](https://github.com/TuSimple/naive-ui/issues/250)
 - Fix `n-input` clear button placeholder prevent clicking on actual component [#288](https://github.com/TuSimple/naive-ui/issues/288)
+- 修复 `n-carousel` 点击当前页对应的控制按钮时，组件显示异常
 
 ## 2.14.0 (2021-06-23)
 

src/carousel/src/Carousel.tsx

@@ -60,8 +60,9 @@ export default defineComponent({
     function setCurrent (value: number): void {
       if (lengthRef.value <= 1) return
       if (inTransition) return
-      inTransition = true
       const { value: current } = currentRef
+      if (value === current) return
+      inTransition = true
       if (current === 1 && value === lengthRef.value && value - current > 1) {
         currentRef.value--
       } else if (