修复完成版对应的issue54，55，56

Former-commit-id: 74894882e9a2b12917de159b0be4af84c9604eda

src/assets/style/fixed/element.scss

@@ -14,3 +14,7 @@
 .el-menu--horizontal {
   border-bottom: none !important;
 }
+
+.el-tabs__item:focus.is-active.is-focus:not(:active) {
+  box-shadow: none !important;
+}

src/layout/header-aside/components/contextmenu/index.vue

@@ -47,7 +47,7 @@ export default {
   },
   methods: {
     watchContextmenu (event) {
-      if (!this.$el.contains(event.target)) this.flag = false
+      if (!this.$el.contains(event.target) || event.button !== 0) this.flag = false
       window.removeEventListener('mousedown', this.watchContextmenu)
     }
   },

src/layout/header-aside/components/tabs/index.vue

@@ -99,12 +99,16 @@ export default {
      */
     handleContextmenu (event) {
       let target = event.target
+
       // 解决 https://github.com/d2-projects/d2-admin/issues/54
-      const attribute = target.getAttribute('aria-controls')
+      let flag = false
-      if (attribute === null) {
+      if (target.className.indexOf('el-tabs__item') > -1) flag = true
-        return
+      else if (target.parentNode.className.indexOf('el-tabs__item') > -1) {
+        target = target.parentNode
+        flag = true
       }
-      if (target.className.indexOf('el-tabs__item') > -1 || target.parentNode.className.indexOf('el-tabs__item') > -1) {
+
+      if (flag) {
         event.preventDefault()
         event.stopPropagation()
         this.contentmenuX = event.clientX