Summary
There two bugs in story

• No guides are rendered. Because typescript code transpiled to class with constructor, overriding SelectionHandler.prototype.guidesEnabled to true no longer works. Extracting plugin instance and setting guidesEnabled for it works fine.
  

  maxGraph/packages/html/stories/Guides.stories.js

  Lines 50 to 51 in 02ea6f1

  	// Enables guides
  	SelectionHandler.prototype.guidesEnabled = true;

• Alt key disabling guides feature not working. isAltDown is not defined error. isAltDown method is moved to eventUtils, simply fixing import.

Description for the changelog
Fixed Guides story