fix($plugin-medium-zoom): disable zoom for links (#1719)

Author: kidonng

packages/@vuepress/plugin-medium-zoom/index.js

@@ -2,7 +2,7 @@ const { path } = require('@vuepress/shared-utils')
 
 module.exports = (options, context) => ({
   define: {
-    SELECTOR: options.selector || '.theme-default-content img',
+    SELECTOR: options.selector || '.theme-default-content :not(a) > img',
     OPTIONS: options.options
   },
   clientRootMixin: path.resolve(__dirname, 'clientRootMixin.js')

packages/docs/docs/plugin/official/plugin-medium-zoom.md

@@ -20,7 +20,7 @@ yarn add -D @vuepress/plugin-medium-zoom@next
 
 ```javascript
 module.exports = {
-  plugins: ['@vuepress/medium-zoom'] 
+  plugins: ['@vuepress/medium-zoom']
 }
 ```
 
@@ -46,7 +46,7 @@ module.exports = {
 ### selector
 
 - Type: `string`
-- Default: `.theme-default-content img`
+- Default: `.theme-default-content :not(a) > img`
 
 Note that `.theme-default-content` is the class name of [`<Content />`](../../guide/using-vue.md#content) component in default theme.
 

packages/docs/docs/zh/plugin/official/plugin-medium-zoom.md

@@ -22,7 +22,7 @@ yarn add -D @vuepress/plugin-medium-zoom@next
 
 ```javascript
 module.exports = {
-  plugins: ['@vuepress/medium-zoom'] 
+  plugins: ['@vuepress/medium-zoom']
 }
 ```
 
@@ -45,10 +45,10 @@ module.exports = {
 
 ## 选项
 
-### selector 
+### selector
 
 - 类型: `string`
-- 默认值: `.theme-default-content img`
+- 默认值: `.theme-default-content :not(a) > img`
 
 值得注意的是， `.theme-default-content` 是默认主题添加给 [`<Content />`](../../guide/using-vue.md#content) 组件的 class name。