formatSpanned
Version of String.format that works on Spanned strings to preserve rich text formatting. Both the format as well as any %s args can be Spanned and will have their formatting preserved. Due to the way Spannables work, any argument's spans will can only be included once in the result. Any duplicates will appear as text only.
Return
the formatted string (with spans).
Parameters
this
@formatSpanned the format string (see java.util.Formatter.format)
args
the list of arguments passed to the formatter. If there are more arguments than required by format, additional arguments are ignored.