Hi,
PluggableTextSpec>>font returns a default font if font is not specified. This results in default font overriding any fonts in the plugged textmorphs :-( as in the case of Help->FontSizeSummary. The exact font to be used to render text should be determined lazily by textMorph and not in pluggable text spec.
My proposed fix has a wide ranging effect, so I am posting it here for a critique before finalizing a patch to Inbox.
Thanks and Regards .. Subbu