Add role='textbox' to Quill input / textarea to stop "touch to search" behaviour

[ripper17]

Steps for Reproduction

1. Visit quilljs.com on a mobile device with e.g. Chrome
2. Select a word that you'd like to format (e.g. to make it bold) in the demo section

Expected behavior:
No browser-pop-up should appear (which is usually giving the options to search, translate, ...)

Actual behavior:
The browser-pop-up "touch to search" will appear

Platforms:

Chrome on Android https://www.whatsmybrowser.org/b/2783Q

Version:

Currently deployed version on the homepage https://quilljs.com

Chrome will not open the touch-to-search popup if a role is being set:
https://developer.chrome.com/blog/tap-to-search

It seems appropriate to set the "textbox" role ( https://www.w3.org/TR/wai-aria-1.2/#textbox , https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role ) in conjunction with the aria-multiline attribute (see w3.org for details).

MDN claims

Whenever possible, rather than using this role, use an element with type="text", for single-line input, or a <textarea> element for multi-line input.

but I believe it is justified to set a role in this case.

It's easy to verify: in DevTools, simply add role="textbox" to the Demo on quilljs.com and notice the changed behaviour: It is now possible to make the headline bold, whereas previously, the "tap-to-search"-popup was covering the toolbar.