Use case

When a user performs a long operation and zk shows "processing", a user still can interact with input components with a keyboard, e.g. change the focus, input characters

Even we enable processing mask, such mask only blocks mouse clicking.

Workaround

• auto disable all button
• disable-key-input.js

related spec.

• ZK-3081 - we block focusing components behind a modal window.

Proposed spec.

1. When ZK shows "processing" with the processing mask enabled, all components don't accept any keyboard input
2. Clients.showBusy() should follow the same behavior.