I can only provide the result after sending, but this message (forced to have both plain-text and HTML parts for comparison) contains two lines/paragraphs without any formatting applied and composed in HTML. As can be seen, the first line is indented in the plain-text part whereas it is not in the HTML version (displayed as typed).
Created attachment 447194
Minimal test case
I can only provide the result after sending, but this message (forced to have both plain-text and HTML parts for comparison) contains two lines/paragraphs without any formatting applied and composed in HTML. As can be seen, the first line is indented in the plain-text part whereas it is not in the HTML version (displayed as typed).