[Shadow DOM] Enhance range validation to support ranges encapsulated by shadow roots #4721
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We're trying to get tinymce working in web components that utilize shadow DOM. Our initial usage of tinymce is for an inline editor with a simple toolbar.
My intent is to create a number of small PRs that progressively fix more issues required in order to make our use cases work, rather than one big blanket PR that makes all tinymce use cases support shadow DOM.
This PR fixes the range validation so that if the range is encapsulated by a shadow root the range still validates as being contained by the document. It finds the top level shadow hosts for the start and end of the selection and validates that they are contained by the document.