Enable undo/redo for markdown editor, apart from firefox#3582

Merged

chandlerprall merged 2 commits intoelastic:feature/markdown-editorfrom chandlerprall:feature/markdown-editor-history

Jun 15, 2020

+114-101

Commits on Jun 9, 2020

Enable undo/redo for markdown editor, apart from firefox
chandlerprall
committed

Commits on Jun 10, 2020

Add test-and-retry logic to insertText to account for ability to focus the text area before brute forcing
chandlerprall
committed