Can not copy texts outside of Modeler container

[kmarcinkowski-objectivity]

Describe the Bug

It's not possible to copy texts placed in DOM outside of BPMN Modeler container with CTRL + C shortcut.

Steps to Reproduce

1. Start Modeler with copy-paste additional module and keyboard bind to window.
2. Place any text content HTML element (e.g. label, link, paragraph, ...) anywhere in body outside of bpmn container.
3. Copy element content and try to paste it e.g. into notepad.

The issue can be also reproduced in https://demo.bpmn.io:

1. Open demo app page.
2. Open developer tools and run js script that adds a paragraph to body:

let p = document.createElement('p');
p.innerHTML = 'copy test';
document.body.prepend(p);

3. Copy the text and try to paste it.

Expected Behavior

It should be possbile to copy any content outside of Modeler normally.

Environment

• Browser: Chrome, Edge
• OS: Windows 10
• Library version: any

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Depends on bpmn-io/diagram-js#281

[nikku]

@kmarcinkowski-objectivity This is likely due to us overriding the default copy shortcut.

Related to bpmn-io/diagram-js#281.