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None of the 0.8 or 0.9 changes in Sigil are related to this issue. Sigil BookView has been doing that for a very very long time. It is an inherent part of editing live html in QtWebkit. The DOM tree that you are editing "live" is internal to that Qt widget and is really not under Sigil direct control. You may not like what it does but it is generating perfectly valid xhtml code. Just code you do not personally like.
To get around the limitations of editing a DOM tree of a web-page live, many authors use Word or LibreOffice to write their book employing proper styles. They then convert this to filtered html and import it into Sigil. They then use Sigil in CodeView with live Preview to make changes if they care about the actual code generated. There are Sigil plugins to help import properly styled word filtered html into proper xhtml in an epub. You may want to try working things that way.
Most standalone xml/html editors understand nothing about epub structure, the opf,and guide, the nav, toc generation, index generation, semantic setting, embedding fonts, etc, nor allow global file name changes with automatic link and opf updating. This is Sigil's main reason for being.
Serious editing in BookView is all but deprecated as it does not provide enough control of the actual html generated for professional epub developers and is not as effective or efficient for real authors to use as real dedicated writing apps like Word and LibreOffice.
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