Merge pull request #1043 from hotlcc/feature/develop-table-cell-multiline-open

table单元格存在多行文本时支持点击“...”展开

src/modules/table.js

@@ -1727,7 +1727,7 @@ layui.define(['laytpl', 'laypage', 'layer', 'form', 'util'], function(exports){
       
       if(hide){
         othis.find('.layui-table-grid-down').remove();
-      } else if(elemCell.prop('scrollWidth') > elemCell.outerWidth()){
+      } else if(elemCell.prop('scrollWidth') > elemCell.outerWidth() || elemCell.find("br").size() > 0){
         if(elemCell.find('.'+ ELEM_GRID_DOWN)[0]) return;
         othis.append('<div class="'+ ELEM_GRID_DOWN +'"><i class="layui-icon layui-icon-down"></i></div>');
       }