Popover: fix popover issues with hover display (#13104)

* Fix issue with popover displaying on focus when configuration is for it to show on hover.
Fix issue with popover timer still running when button clicked and parent element no longer visible (e.g. keepalive component).

* Updated to pass tests

* Correct documentation for el-date-picker

* Changes as per ziyoung review

examples/docs/en-US/date-picker.md

@@ -373,6 +373,8 @@ Pay attention to capitalization
 | `yyyy` | year | | 2017 |
 | `M`  | month | no leading 0 | 1 |
 | `MM` | month | | 01 |
+| `MMM` | month | | Jan |
+| `MMMM` | month | | January |
 | `W`  | week | only for week picker's `format`; no leading 0 | 1 |
 | `WW` | week | only for week picker's `format`| 01 |
 | `d`  | day | no leading 0 | 2 |

packages/popover/src/main.vue

@@ -123,6 +123,14 @@ export default {
     }
   },
 
+  beforeDestroy() {
+    this.cleanup();
+  },
+
+  deactivated() {
+    this.cleanup();
+  },
+
   methods: {
     doToggle() {
       this.showPopper = !this.showPopper;
@@ -135,14 +143,14 @@ export default {
     },
     handleFocus() {
       addClass(this.referenceElm, 'focusing');
-      if (this.trigger !== 'manual') this.showPopper = true;
+      if (this.trigger === 'click' || this.trigger === 'focus') this.showPopper = true;
     },
     handleClick() {
       removeClass(this.referenceElm, 'focusing');
     },
     handleBlur() {
       removeClass(this.referenceElm, 'focusing');
-      if (this.trigger !== 'manual') this.showPopper = false;
+      if (this.trigger === 'click' || this.trigger === 'focus') this.showPopper = false;
     },
     handleMouseEnter() {
       clearTimeout(this._timer);
@@ -186,6 +194,11 @@ export default {
     handleAfterLeave() {
       this.$emit('after-leave');
       this.doDestroy();
+    },
+    cleanup() {
+      if (this.openDelay) {
+        clearTimeout(this._timer);
+      }
     }
   },