From b5b31f2af871b48a875eec0acf188022a2447836 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A5=BD=E5=A4=9A=E5=A4=A7=E7=B1=B3?= <lost1q84@gmail.com>
Date: Tue, 17 Aug 2021 16:10:05 +0800
Subject: [PATCH] Cascader: optimize performance (#21231)

---
 packages/cascader/src/cascader.vue | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/cascader/src/cascader.vue b/packages/cascader/src/cascader.vue
index 29e504dfa0..25e0ff6b7f 100644
--- a/packages/cascader/src/cascader.vue
+++ b/packages/cascader/src/cascader.vue
@@ -413,6 +413,7 @@ export default {
     handleDropdownLeave() {
       this.filtering = false;
       this.inputValue = this.presentText;
+      this.doDestroy();
     },
     handleKeyDown(event) {
       switch (event.keyCode) {
@@ -643,7 +644,9 @@ export default {
         const offsetHeight = Math.round(tags.getBoundingClientRect().height);
         const height = Math.max(offsetHeight + 6, inputInitialHeight) + 'px';
         inputInner.style.height = height;
-        this.updatePopper();
+        if (this.dropDownVisible) {
+          this.updatePopper();
+        }
       }
     },