perf: nav style

Author: ZhaoJiSen

src/app/elements/nav/nav.component.scss

@@ -4,12 +4,18 @@
   }
 }
 
+:host {
+  display: block;
+  height: 30px;
+}
+
 .nav {
   display: flex;
+  height: 30px;
+  box-sizing: border-box;
   justify-content: space-between;
   background-color: var(--el-nav-bg-color);
   font-weight: 400;
-  padding-bottom: 1px;
 
   .ant-menu-horizontal > .ant-menu-submenu {
     top: 0;

src/app/pages/main/main.component.scss

@@ -42,11 +42,6 @@
   cursor: col-resize;;
 }
 
-elements-nav {
-  height: 30px;
-}
-
-
 nz-splitter-panel .as-split-area > p {
   padding: 5px;
 }
@@ -148,4 +143,4 @@ nz-splitter-panel {
 //     min-width: 71px !important;
 //   }
 // }
-}
+}

src/sass/ant.less

@@ -8,7 +8,8 @@
 
 .ant-menu-submenu.ant-menu-submenu-placement-bottom,
 .ant-menu-submenu.ant-menu-submenu-popup.ant-menu-submenu-placement-bottomLeft {
-  top: 1px !important;
+  // Slightly overlap the trigger so slow pointer movement cannot cross a hover gap.
+  top: -1px !important;
 }
 
 .ant-select {