DevTools: Only show StrictMode badge on root elements (facebook#23012)

* DevTools: Only show StrictMode badge on root elements

Showing an inline non-compliance badge for every element in the tree is noisy. This commit changes it so that we only show inline icons for root elements (although we continue to show an icon for inspected elements regardless).

Author: Brian Vaughn

packages/react-devtools-shared/src/devtools/views/Components/Element.js

@@ -118,6 +118,10 @@ export default function Element({data, index, style}: Props) {
     type,
   } = ((element: any): ElementType);
 
+  // Only show strict mode non-compliance badges for top level elements.
+  // Showing an inline badge for every element in the tree would be noisy.
+  const showStrictModeBadge = isStrictModeNonCompliant && depth === 0;
+
   let className = styles.Element;
   if (isSelected) {
     className = treeFocused
@@ -194,7 +198,7 @@ export default function Element({data, index, style}: Props) {
             }
           />
         )}
-        {isStrictModeNonCompliant && (
+        {showStrictModeBadge && (
           <Icon
             className={
               isSelected && treeFocused