fix(form-item): autosize textarea may overflow (#94)

* fix: n-form-item's grid-template-columns

* Update src/form/src/styles/form-item.cssr.ts

Co-authored-by: 07akioni <07akioni2@gmail.com>

CHANGELOG.en-US.md

@@ -5,6 +5,7 @@
 ### Fixes
 
 - Fix `n-calendar`'s `on-update:value` prop type.
+- Fix `n-form-item`'s style attribute `grid-template-columns` influence on the layout of child elements. [#93](https://github.com/TuSimple/naive-ui/pull/93)
 
 ## 2.11.7
 

CHANGELOG.zh-CN.md

@@ -5,6 +5,7 @@
 ### Fixes
 
 - 修复 `n-calendar` 的 `on-update:value` 属性类型
+- 修复 `n-form-item` 的 `grid-template-columns` 样式属性对子元素布局的影响 [#93](https://github.com/TuSimple/naive-ui/pull/93)
 
 ## 2.11.7
 

src/form/src/styles/form-item.cssr.ts

@@ -64,6 +64,7 @@ export default cB('form-item', {
       "blank"
       "feedback";
     grid-template-rows: var(--label-height) 1fr;
+    grid-template-columns: minmax(0, 100%);
   `, [
     cM('no-label', `
       grid-template-areas: