refactor(datagrid-web): simplify RefreshIndicator usage

Author: samuelreichert

packages/modules/data-widgets/src/themesource/datawidgets/web/_datagrid.scss

@@ -432,10 +432,7 @@ $root: ".widget-datagrid";
     &-refresh-container {
         grid-column: 1 / -1;
         padding: 0;
-
-        &--hidden {
-            display: none;
-        }
+        position: relative;
     }
 
     &-refresh-indicator {

packages/pluggableWidgets/datagrid-web/src/components/RefreshIndicator.tsx

@@ -1,14 +1,9 @@
-import classNames from "classnames";
 import { createElement, ReactElement } from "react";
 
-export function RefreshIndicator({ show }: { show: boolean }): ReactElement {
+export function RefreshIndicator(): ReactElement {
     return (
         <div className="tr" role="row">
-            <div
-                className={classNames("th widget-datagrid-refresh-container", {
-                    "widget-datagrid-refresh-container--hidden": !show
-                })}
-            >
+            <div className="th widget-datagrid-refresh-container">
                 <progress className="widget-datagrid-refresh-indicator" />
             </div>
         </div>

packages/pluggableWidgets/datagrid-web/src/components/Widget.tsx

@@ -195,7 +195,7 @@ const Main = observer(<C extends GridColumn>(props: WidgetProps<C>): ReactElemen
                         isLoading={props.columnsLoading}
                         preview={props.preview}
                     />
-                    <RefreshIndicator show={showRefreshIndicator} />
+                    {showRefreshIndicator ? <RefreshIndicator /> : null}
                     <GridBody
                         isFirstLoad={props.isFirstLoad}
                         isFetchingNextBatch={props.isFetchingNextBatch}