remove outmoded code from markdown widget hotkeys

src/components/EditorWidgets/Markdown/MarkdownControl/VisualEditor/keys.js

@@ -3,37 +3,6 @@ import { isHotkey } from 'is-hotkey';
 
 export default onKeyDown;
 
-/**
- * Minimal re-implementation of Slate's undo/redo functionality, but with focus
- * forced back into editor afterward.
- */
-function changeHistory(change, type) {
-
-  /**
-   * Get the history for undo or redo (determined via `type` param).
-   */
-  const { history } = change.value;
-  if (!history) return;
-  const historyOfType = history[`${type}s`];
-
-  /**
-   * If there is a next history item to apply, and it's valid, apply it.
-   */
-  const next = historyOfType.first();
-  const historyOfTypeIsValid = historyOfType.size > 1
-    || (next && next.length > 1)
-    || (next && next[0] && next[0].type !== 'set_selection';
-
-  if (next && historyOfTypeIsValid) {
-    change[type]();
-  }
-
-  /**
-   * Always ensure focus is set.
-   */
-  return change.focus();
-}
-
 function onKeyDown(event, change) {
   const createDefaultBlock = () => {
     return Block.create({
@@ -70,26 +39,9 @@ function onKeyDown(event, change) {
   }
 
   if (isHotkey(`mod+${event.key}`, event)) {
-
-    /**
-     * Undo and redo work automatically with Slate, but focus is lost in certain
-     * actions. We override Slate's built in undo/redo here and force focus
-     * back to the editor each time.
-     */
-    if (event.key === 'y') {
-      event.preventDefault();
-      return changeHistory(change, 'redo');
-    }
-
-    if (event.key === 'z') {
-      event.preventDefault();
-      return changeHistory(change, event.isShift ? 'redo' : 'undo');
-    }
-
     const marks = {
       b: 'bold',
       i: 'italic',
-      u: 'underline',
       s: 'strikethrough',
       '`': 'code',
     };