This doesn't quite fix all the problems, as the outer editor doesn't get callbacks
when the position changes in the inner editors (and the inner ones aren't propogating
the callbacks currently) so the "n/m matches" display doesn't update properly in that
case. Also, it doesn't (yet) try to draw the search bubbles for embedded editors
Still, progress has been made; at least the bar is not red anymore when there are
hits only in embedded editors
closes PR 12786
to avoid duplicate code between the drracket support for printing and
for write/display; also add a special case for 2htdp/image images
because they can be trusted across the boundary between DrRacket's
implementation and the user's program (as there is no way to embed
arbitrary code into a 2htdp/image image)
This drawing bug was that the DC's state wasn't being
initialized all of the way. In particular, the text-mode
wasn't being set and so, in rare occasions, other drawing
code would (legally) leave it in 'solid mode with a non-white
background color also set. Which would cause those two things
to draw incorrectly.
