Even if I did reuse the code internally in Sigil you could theoretically be live editing more than one xhtml file at the same time. So that type of dialog would have to be blocking / modal and only work on xhtml file at a time. Not any different than what you can accomplish with a simple Find and Replace for img tags and updating each tag's alt data in CodeView while looking at the image in the synced Preview.
So there would be no real benefit in the end.
Glad you find AccessAide useful.
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