Revert defaultPreventation in keyDown

Author: eps1lon

packages/material-ui/src/Chip/Chip.js

@@ -324,7 +324,13 @@ const Chip = React.forwardRef(function Chip(props, ref) {
       onKeyDown(event);
     }
 
-    if (['Backspace', 'Delete', 'Escape'].indexOf(event.key) !== -1) {
+    // Ignore events from children of `Chip`.
+    // TODO: Remove in v5. It doesn't handle library code
+    if (event.currentTarget !== event.target) {
+      return;
+    }
+
+    if ([' ', 'Enter', 'Backspace', 'Delete', 'Escape'].indexOf(event.key) !== -1) {
       event.preventDefault();
     }
   };