Fix keyboard focus does not retain on 'New Database' button after closing the 'New Database' blade via ESC key (#1109)

* Fix a11y new database button focus issue

* Update test snapshot and other issues

src/Explorer/Panes/AddDatabasePanel/AddDatabasePanel.tsx

@@ -23,10 +23,12 @@ import { RightPaneForm, RightPaneFormProps } from "../RightPaneForm/RightPaneFor
 
 export interface AddDatabasePaneProps {
   explorer: Explorer;
+  buttonElement?: HTMLElement;
 }
 
 export const AddDatabasePanel: FunctionComponent<AddDatabasePaneProps> = ({
   explorer: container,
+  buttonElement,
 }: AddDatabasePaneProps) => {
   const closeSidePanel = useSidePanel((state) => state.closeSidePanel);
   let throughput: number;
@@ -77,6 +79,7 @@ export const AddDatabasePanel: FunctionComponent<AddDatabasePaneProps> = ({
       dataExplorerArea: Constants.Areas.ContextualPane,
     };
     TelemetryProcessor.trace(Action.CreateDatabase, ActionModifiers.Open, addDatabasePaneOpenMessage);
+    buttonElement.focus();
   }, []);
 
   const onSubmit = () => {

src/Explorer/SplashScreen/SplashScreen.tsx

@@ -307,16 +307,23 @@ export class SplashScreen extends React.Component<SplashScreenProps> {
         iconSrc: AddDatabaseIcon,
         title: "New " + getDatabaseName(),
         description: undefined,
-        onClick: () =>
-          useSidePanel
-            .getState()
-            .openSidePanel("New " + getDatabaseName(), <AddDatabasePanel explorer={this.container} />),
+        onClick: () => this.openAddDatabasePanel(),
       });
     }
 
     return items;
   }
 
+  private openAddDatabasePanel() {
+    const newDatabaseButton = document.activeElement as HTMLElement;
+    useSidePanel
+      .getState()
+      .openSidePanel(
+        "New " + getDatabaseName(),
+        <AddDatabasePanel explorer={this.container} buttonElement={newDatabaseButton} />
+      );
+  }
+
   private decorateOpenCollectionActivity({ databaseId, collectionId }: MostRecentActivity.OpenCollectionItem) {
     return {
       iconSrc: NotebookIcon,