fix(Table): z-index of stickyheader with lock columns, close #2832

Author: youluna

src/table/main.scss

@@ -72,9 +72,14 @@
         }
     }
     &-affix {
-        z-index: 10;
+        z-index: 1;
         overflow: hidden;
     }
+    &-stickylock {
+        #{$table-prefix}-affix {
+            z-index: 10;
+        }
+    }
     &-header-resizable {
         position: relative;
         #{$table-prefix}-resize-handler {

src/table/new-lock.jsx

@@ -368,6 +368,7 @@ export default function stickyLock(BaseComponent) {
             components.Row = components.Row || LockRow;
             className = classnames({
                 [`${prefix}table-lock`]: true,
+                [`${prefix}table-stickylock`]: true,
                 [`${prefix}table-wrap-empty`]: !dataSource.length,
                 [className]: className,
             });