Add focus indication for compact menu (#213463)

indicate when compact menu is focused

Author: benibenj

src/vs/workbench/browser/parts/titlebar/media/menubarControl.css

@@ -22,6 +22,10 @@
 	color: var(--vscode-activityBar-foreground);
 }
 
+.monaco-workbench .activitybar .menubar.compact > .menubar-menu-button:focus {
+	background-color: var(--vscode-menubar-selectionBackground);
+}
+
 .monaco-workbench .menubar.inactive:not(.compact) > .menubar-menu-button,
 .monaco-workbench .menubar.inactive:not(.compact) > .menubar-menu-button .toolbar-toggle-more  {
 	color: var(--vscode-titleBar-inactiveForeground);