Missing input label on hidden field

[cami-dev]

When running cypress-html-validate and cypress-axe or other tools to check accessibility or html-validation on the quill-editor element I get two warnings:

1. input missing label.
   Element: <input type="text" data-formula="e=mc^2" data-link="https://quilljs.com" data-video="Embed URL">

2. Anchor link must have a text describing its purpose:
   Element: <a class="ql-preview" rel="noopener noreferrer" target="_blank" href="about:blank"></a>

Both of these elements are hidden in the dom with display: none; hence they are then still visible to validation tools etc.

<div class="ql-tooltip ql-hidden">
<a class="ql-preview" rel="noopener noreferrer" target="_blank" href="about:blank"></a>
<input type="text" data-formula="e=mc^2" data-link="https://quilljs.com" data-video="Embed URL">
<a class="ql-action"></a>
<a class="ql-remove"></a>
</div>

This template seems to be added here: https://github.com/slab/quill/blob/ebe16ca24724ac4f52505628ac2c4934f0a98b85/packages/quill/src/themes/snow.ts

Version:
2.0.3

All other things pass with the editor so a bit sad to have to fall on what is probably a simple fix :) Guessing you can just convert the :before that contains the "Visit url:"-text to a real <label></label> and wrap it around the input and just add text to the link-tags and you are good to go.

We get around this by excluding ql-hidden in our tests but would be nice not having to do that for every project we use quill in.