You've completely ignored my suggestion to try Sigil's Open With feature. It will allow you to use the html editor of your choice while using Sigil to manage the epub. There is no need for the html editor itself to be epub-aware; because Sigil takes care of that.
Because of this ability to use full-featured html editors from within Sigil, Sigil's Code View editor is just about as full-featured as it's ever going to get.
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