fix(dashboard): undo and redo buttons weird alignment (#16417)

* fix(dashboard-ui): undo and redo buttons weird alignment

* fix(Explore control pane): keyboard nav & focus

* lint: lint frontend

* fix: fix redo and undo button style

* lint: lint line

* lint: lint line

Co-authored-by: xuzhebin <maxhui2020@gmail.com>

superset-frontend/src/components/Button/index.tsx

@@ -63,6 +63,7 @@ export interface ButtonProps {
   htmlType?: 'button' | 'submit' | 'reset';
   cta?: boolean;
   loading?: boolean | { delay?: number | undefined } | undefined;
+  showMarginRight?: boolean;
 }
 
 export default function Button(props: ButtonProps) {
@@ -76,6 +77,7 @@ export default function Button(props: ButtonProps) {
     cta,
     children,
     href,
+    showMarginRight = true,
     ...restProps
   } = props;
 
@@ -154,8 +156,8 @@ export default function Button(props: ButtonProps) {
   } else {
     renderedChildren = Children.toArray(children);
   }
-
+  const firstChildMargin =
-  const firstChildMargin = renderedChildren.length > 1 ? theme.gridUnit * 2 : 0;
+    showMarginRight && renderedChildren.length > 1 ? theme.gridUnit * 2 : 0;
 
   const button = (
     <AntdButton

superset-frontend/src/dashboard/components/Header/index.jsx

@@ -526,6 +526,7 @@ class Header extends React.PureComponent {
                       buttonStyle={
                         this.state.emphasizeUndo ? 'primary' : undefined
                       }
+                      showMarginRight={false}
                     >
                       <i
                         title="Undo"
@@ -541,6 +542,7 @@ class Header extends React.PureComponent {
                       buttonStyle={
                         this.state.emphasizeRedo ? 'primary' : undefined
                       }
+                      showMarginRight={false}
                     >
                       &nbsp;
                       <i title="Redo" className="redo-action fa fa-share" />