[flutter]: tooltip for add page button

app_flowy/lib/workspace/presentation/widgets/menu/widget/app/header/header.dart

@@ -98,11 +98,14 @@ class MenuAppHeader extends StatelessWidget {
   }
 
   Widget _renderAddButton(BuildContext context) {
-    return AddButton(
-      onSelected: (viewType) {
-        context.read<AppBloc>().add(AppEvent.createView("New view", "", viewType));
-      },
-    ).padding(right: MenuAppSizes.headerPadding);
+    return Tooltip(
+      message: "Quickly add a page inside",
+      child: AddButton(
+        onSelected: (viewType) {
+          context.read<AppBloc>().add(AppEvent.createView("New view", "", viewType));
+        },
+      ).padding(right: MenuAppSizes.headerPadding),
+    );
   }
 
   void _handleAction(BuildContext context, Option<AppDisclosureAction> action) {

app_flowy/lib/workspace/presentation/widgets/menu/widget/app/section/item.dart

@@ -60,7 +60,6 @@ class ViewSectionItem extends StatelessWidget {
     ];
 
     if (onHover || state.isEditing) {
-      children.add(const Spacer());
       children.add(
         ViewDisclosureButton(
           onTap: () => context.read<ViewBloc>().add(const ViewEvent.setIsEditing(true)),