fix: change shadow selection polyfill implementation #2
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Description
The current shadow selection polyfill is causing several issues on mobile / desktop Safaris (vaadin/web-components#2115, vaadin/web-components#2139).
This change replaces the polyfill with a simpler alternative that does not have these issues. The changes are based on this PR in the Nuxeo Quill fork: nuxeo#2. Apart from that some additional changes were added by Diego and myself to fix support for IE and Edge, and to fix the selection change listener in
selection.js
that was not firing anymore.