fix(main canvas): bottom space

When hide add button and back to top button,we donot need 80px space bottom

README-zh.md

@@ -182,6 +182,7 @@ Luckysheet是MIT许可的开源项目，其持续稳定的开发离不开这些
 - [@gsw945](https://github.com/gsw945)
 - [@swen-xiong](https://github.com/swen-xiong)
 - [@lzmch](https://github.com/lzmch)
+- [@kdevilpf](https://github.com/kdevilpf)
 
 ## 版权信息
 [MIT](http://opensource.org/licenses/MIT)

README.md

@@ -178,6 +178,7 @@ Funds donated via Patreon go directly to support mengshukeji's work on Luckyshee
 - [@gsw945](https://github.com/gsw945)
 - [@swen-xiong](https://github.com/swen-xiong)
 - [@lzmch](https://github.com/lzmch)
+- [@kdevilpf](https://github.com/kdevilpf)
 
 ## License
 [MIT](http://opensource.org/licenses/MIT)

docs/about/README.md

@@ -21,3 +21,4 @@ Luckysheet is a project led by an individual and jointly developed by several fr
 - [@gsw945](https://github.com/gsw945)
 - [@swen-xiong](https://github.com/swen-xiong)
 - [@lzmch](https://github.com/lzmch)
+- [@kdevilpf](https://github.com/kdevilpf)

docs/zh/about/README.md

@@ -21,3 +21,4 @@ Luckysheet是由个人主导、几个志同道合的小伙伴一同开发的项
 - [@gsw945](https://github.com/gsw945)
 - [@swen-xiong](https://github.com/swen-xiong)
 - [@lzmch](https://github.com/lzmch)
+- [@kdevilpf](https://github.com/kdevilpf)

docs/zh/guide/config.md

@@ -1213,7 +1213,7 @@ Luckysheet开放了更细致的自定义配置选项，分别有
 ## 工作簿
 
 ### workbookCreateBefore
-（TODO）
+
 - 类型：Function
 - 默认值：null
 - 作用：表格创建之前触发。旧的钩子函数叫做`beforeCreateDom`
@@ -1222,7 +1222,7 @@ Luckysheet开放了更细致的自定义配置选项，分别有
     
 ------------
 ### workbookCreateAfter
-（TODO）
+
 - 类型：Function
 - 默认值：null
 - 作用：表格创建之后触发

src/global/rhchInit.js

@@ -25,9 +25,15 @@ export default function rhchInit(rowheight, colwidth) {
             Store.visibledatarow.push(Store.rh_height); //行的临时长度分布
         }
 
+        // 如果增加行和回到顶部按钮隐藏，则减少底部空白区域，但是预留足够空间给单元格下拉按钮
+        if(!luckysheetConfigsetting.enableAddRow && !luckysheetConfigsetting.enableAddBackTop){
+            Store.rh_height += 29;
+        }else{
             Store.rh_height += 80;  //最底部增加空白
         }
        
+    }
+
     //列宽
     if(colwidth != null){
         Store.visibledatacolumn = [];