Tree: add indent, update docs

examples/docs/en-US/input.md

@@ -608,6 +608,7 @@ Search data from server-side.
 |autosize | whether textarea has an adaptive height, only works when `type` is 'textarea'. Can accept an object, e.g. { minRows: 2, maxRows: 6 }  | boolean/object | — | false |
 |auto-complete | same as `auto-complete` in native input | string | on/off | off |
 |name | same as `name` in native input | string | — | — |
+| readonly | same as `readonly` in native input | boolean | — | false |
 |max | same as `max` in native input | * | — | — |
 |min | same as `min` in native input | * | — | — |
 |resize| control the resizability | string | none, both, horizontal, vertical | — |

examples/docs/zh-CN/input.md

@@ -765,6 +765,7 @@ export default {
 | autosize      | 自适应内容高度，只对 `type="textarea"` 有效，可传入对象，如，{ minRows: 2, maxRows: 6 }  |  boolean/object | — |  false   |
 | auto-complete | 原生属性，自动补全 | string | on, off | off |
 | name | 原生属性 | string | — | — |
+| readonly | 原生属性，是否只读 | boolean | — | false |
 | max | 原生属性，设置最大值 | * | — | — |
 | min | 原生属性，设置最小值 | * | — | — |
 | resize | 控制是否能被用户缩放 | string | none, both, horizontal, vertical | — |

packages/theme-default/src/message-box.css

@@ -14,7 +14,6 @@
     width: var(--msgbox-width);
     border-radius: var(--msgbox-border-radius);
     font-size: var(--msgbox-font-size);
-    -webkit-user-select: none;
     overflow: hidden;
     backface-visibility: hidden;
     @e wrapper {

packages/tree/src/tree-node.vue

@@ -8,7 +8,7 @@
       'is-hidden': !node.visible
     }">
     <div class="el-tree-node__content"
-      :style="{ 'padding-left': (node.level - 1) * 16 + 'px' }">
+      :style="{ 'padding-left': (node.level - 1) * tree.indent + 'px' }">
       <span
         class="el-tree-node__expand-icon"
         @click.stop="handleExpandIconClick"

packages/tree/src/tree.vue

@@ -81,7 +81,11 @@
       currentNodeKey: [String, Number],
       load: Function,
       filterNodeMethod: Function,
-      accordion: Boolean
+      accordion: Boolean,
+      indent: {
+        type: Number,
+        default: 16
+      }
     },
 
     computed: {