ui5-dialog: scrolling is blocked when dialog is closed with Esc key

[MarcusNotheis]

Bug Description

If a ui5-dialog is closed with the Escape key, it seems like it doesn't remove the scroll blocking. If you close if the the close() method, the scroll blocking gets removed as expected.

Expected Behavior

Scroll Blocking should be removed when closing the dialog via Esc, like in 1.0.0-rc.14.

Steps to Reproduce

1. Open: https://codesandbox.io/s/thirsty-bouman-cb80u?file=/src/App.js
2. Scroll through the page, everything is working fine.
3. Click Open Dialog, close it with the close button in the footer, try to scroll again. --> Still works fine
4. Click Open Dialog again, then press Esc and try to scroll again. --> Scrolling is now blocked
5. Optional: open the dialog again and press the close button, scrolling works fine again

Isolated Example

https://codesandbox.io/s/thirsty-bouman-cb80u?file=/src/App.js

Context

• UI5 Web Components version: 1.0.0-rc.15
• OS/Platform: macOS
• Browser: Chrome 92.0.4515.131
• Affected component: ui5-dialog, maybe even the base class ui5-popup?

Priority

• Low
• Medium
• High
• Very High

Note: The priority might be re-evaluated by the issue processor.

Stakeholder Info (if applicable)

• Organization: SAP Customer Advisory / UI5 Web Components for React

[unazko]

Hello @SAP/ui5-webcomponents-topic-rd,

The issue is reproducible via the provided steps.

Regards,
Boyan