wonderzhu

when I copy img into richText , the base64 img always append to the start of content

test覆盖率到90%

### 🐛 Bug description [Please make everyone to understand it] 打开世界地图的行政区域图demo, 报两种错误  下图是本地，报错内容和codesandbox一样   ### 📷 Step 打开世界地图的行政区域图 ### 🏞 Expected result 正确显示 ### 🚑 Any additional [like...