[O] Previewing inline-LaTeX with imagemagick?

[Mike Gauland]

I've been playing with tikz to create a flowchart in my org file. The image is
rendered correctly when I export to PDF, of course, and setting the 'latex'
option to 'imagemagick' generates a PNG when I export the file to HTML. However,
if I try to preview that block with org-preview-latex-fragment (C-c C-x C-l), I
 just get a blank square (a placeholder).

I think this is because dvipng doesn't handle the postscript generated by tikz.
I've worked around this by shadowing the system dvipng with a script in my local
bin directory, that sends the dvi through dvips then convert to generate the
png. This also works for HTML export (using latex:dvipng).  

The new 'latex:imagemagick' option is a cleaner solution. Would it be possible
to use the same code for previewing fragments?

I'm happy to help with the necessary changes, if some knowledgeable with the
relevant source code can get me started in the right direction.

--Mike