Text color and math mode.

[fryguybob]

It looks like we use \pgfsetfillcolor for coloring text but this has odd behavior with text that has math components:

example :: Diagram B
example = circle 2 `atop` (baselineText "$\\frac{1}{2}$" & fc red)

The text is the right color, but the fraction bar is not:

If I add a color command using the fc color name that gets defined in the output I can work around the issue:

example :: Diagram B
example = circle 2 `atop` (baselineText "\\color{fc}$\\frac{1}{2}$" & fc red)

[byorgey]

Hmm, weird. What do you think is the right way to fix this?

[fryguybob]

I don't really understand why PGF does what it does, but I think it might be fine to emit \color{fc} inside every \pgftext if \definecolor{fc} is already emitted in that scope. Seems like a lot of stuff to emit for a rare use case...