improve dropdown/cascader/select customization

components/cascader/style/index.less

@@ -125,7 +125,7 @@
   &-menus {
     position: absolute;
     z-index: @zindex-dropdown;
-    font-size: @font-size-base;
+    font-size: @cascader-dropdown-font-size;
     white-space: nowrap;
     background: @component-background;
     border-radius: @border-radius-base;
@@ -134,7 +134,6 @@
     ul,
     ol {
       margin: 0;
-      padding: 0;
       list-style: none;
     }
 
@@ -165,7 +164,7 @@
     min-width: 111px;
     height: 180px;
     margin: 0;
-    padding: 0;
+    padding: @cascader-dropdown-edge-child-vertical-padding 0;
     overflow: auto;
     vertical-align: top;
     list-style: none;
@@ -185,8 +184,8 @@
     }
   }
   &-menu-item {
-    padding: 5px @control-padding-horizontal;
-    line-height: 22px;
+    padding: @cascader-dropdown-vertical-padding @control-padding-horizontal;
+    line-height: @cascader-dropdown-line-height;
     white-space: nowrap;
     cursor: pointer;
     transition: all 0.3s;

components/dropdown/style/index.less

@@ -49,7 +49,7 @@
   &-menu {
     position: relative;
     margin: 0;
-    padding: 4px 0;
+    padding: @dropdown-edge-child-vertical-padding 0;
     text-align: left;
     list-style-type: none;
     background-color: @component-background;
@@ -113,6 +113,18 @@
         transition: all 0.3s;
       }
 
+      &:first-child {
+        & when (@dropdown-edge-child-vertical-padding = 0) {
+          border-radius: @border-radius-base @border-radius-base 0 0;
+        }
+      }
+
+      &:last-child {
+        & when (@dropdown-edge-child-vertical-padding = 0) {
+          border-radius: 0 0 @border-radius-base @border-radius-base;
+        }
+      }
+
       &-selected,
       &-selected > a {
         color: @dropdown-selected-color;

components/select/style/index.less

@@ -469,6 +469,7 @@
   &-menu {
     max-height: 250px;
     margin-bottom: 0;
+    padding: @select-dropdown-edge-child-vertical-padding 0;  //Change
     padding-left: 0; // Override default ul/ol
     overflow: auto;
     list-style: none;
@@ -499,11 +500,12 @@
     &-item {
       position: relative;
       display: block;
-      padding: 5px @control-padding-horizontal;
+      padding: @select-dropdown-vertical-padding @control-padding-horizontal;
       overflow: hidden;
       color: @text-color;
       font-weight: normal;
-      line-height: 22px;
+      font-size: @select-dropdown-font-size;
+      line-height: @select-dropdown-line-height;
       white-space: nowrap;
       text-overflow: ellipsis;
       cursor: pointer;
@@ -514,11 +516,15 @@
       }
 
       &:first-child {
-        border-radius: @border-radius-base @border-radius-base 0 0;
+        & when (@select-dropdown-edge-child-vertical-padding = 0) {
+          border-radius: @border-radius-base @border-radius-base 0 0;
+        }
       }
 
       &:last-child {
-        border-radius: 0 0 @border-radius-base @border-radius-base;
+        & when (@select-dropdown-edge-child-vertical-padding = 0) {
+          border-radius: 0 0 @border-radius-base @border-radius-base;
+        }
       }
 
       &-selected {

components/style/themes/default.less

@@ -290,6 +290,7 @@
 
 //Dropdown
 @dropdown-vertical-padding: 5px;
+@dropdown-edge-child-vertical-padding: 4px;
 @dropdown-font-size: @font-size-base;
 @dropdown-line-height: 22px;
 
@@ -337,10 +338,21 @@
 @select-border-color: @border-color-base;
 @select-item-selected-font-weight: 600;
 @select-dropdown-bg: @component-background;
+@select-dropdown-vertical-padding: @dropdown-vertical-padding;
+@select-dropdown-edge-child-vertical-padding: @dropdown-edge-child-vertical-padding;
+@select-dropdown-font-size: @dropdown-font-size;
+@select-dropdown-line-height: @dropdown-line-height;
 @select-item-selected-bg: @background-color-light;
 @select-item-active-bg: @item-active-bg;
 @select-background: @component-background;
 
+// Cascader
+// ----
+@cascader-dropdown-vertical-padding: @dropdown-vertical-padding;
+@cascader-dropdown-edge-child-vertical-padding: @dropdown-edge-child-vertical-padding;
+@cascader-dropdown-font-size: @dropdown-font-size;
+@cascader-dropdown-line-height: @dropdown-line-height;
+
 // Anchor
 // ---
 @anchor-border-color: @border-color-split;