Close button supports Esc key pressed

[gjanblaszczyk]

Description

The PR fixes a potential regression that was introduced in v7.5.5.
The Modal window can't be closed via Esc key pressed when the close button is focused.

To reproduce the problem:

1. open a modal window.
2. use tab key to focus a close button.
3. when a close button is focused then press Esc button.

Specific Changes proposed

Overrides handleKeyDown method inside CloseButton.
The method handles Esc key pressed and triggers click event.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[gkatsev]

This seems reasonable to me.

Though, would you be able to revert the package-lock.json changes?

[gjanblaszczyk]

Yes, of course. I have reverted package-lock.json.