cubicweb #9428951 _cwtracehtml is nearly useless on forms [in-progress]

Using _cwtracehtml to debug forms has exactly zero value. The HTML shows up in a single block, and indeed the main FormRenderer writes the entire form using a single call to w().

prioritynormal
typeenhancement
done in<not specified>
load3.000
load left3.000
closed by<not specified>
patch[web] Enable tracing on nested UStringIOs (part 2) [rejected][web] Enable tracing on nested UStringIOs (closes #9428951) [rejected][utils] Allow writing UStringIOs to UStringIO [rejected][web/views] Use UStringIO instead of lists [rejected]
attachment