RichText: fix wordwise selection on Windows (#14184)

* RichText: fix wordwise selection on Windows

* Fix crtl ctrl typo.

* Add docs

packages/editor/src/components/rich-text/index.js

@@ -573,13 +573,14 @@ export class RichText extends Component {
  /**
  * Handles a keydown event.
  *
- * @param {KeyboardEvent} event The keydown event.
+ * @param {SyntheticEvent} event A synthetic keyboard event.
  */
  onKeyDown( event ) {
- const { keyCode, shiftKey, altKey, metaKey } = event;
+ const { keyCode, shiftKey, altKey, metaKey, ctrlKey } = event;
 
  if (
- ! shiftKey && ! altKey && ! metaKey &&
+ // Only override left and right keys without modifiers pressed.
+ ! shiftKey && ! altKey && ! metaKey && ! ctrlKey &&
  ( keyCode === LEFT || keyCode === RIGHT )
  ) {
  this.handleHorizontalNavigation( event );
@@ -661,6 +662,13 @@ export class RichText extends Component {
  }
  }
 
+ /**
+ * Handles horizontal keyboard navigation when no modifiers are pressed. The
+ * navigation is handled separately to move correctly around format
+ * boundaries.
+ *
+ * @param {SyntheticEvent} event A synthetic keyboard event.
+ */
  handleHorizontalNavigation( event ) {
  const value = this.createRecord();
  const { formats, text, start, end } = value;