HTML <div>BEFORE HOST</div> <div id="host"></div> Shadow DOM <div id="shadow-host">SHADOW (BEFORE)<shadow></shadow>SHADOW(AFTER)</div> Nested Shadow DOM <div>NESTED BEFORE</div><shadow></shadow><div>NESTED AFTER</div> Select from SHADOW(AFTER) to BEFORE HOST without releasing mouse. Then selection blinks.
I cannot reproduce this anymore. Let's mark this INVALID until a repro is found again.