I want to increase the font size of my concealed latex symbols / titles. I haven't found a straightforward way to do this. Is there an obscure hack that would work?
It looks as though it has been done in Emacs AUCTeX: aquamacs screenshot
I'm aware that the formula in the screenshot comes from a png file, but at least it uses a bigger font for the title.
While Vim does not allow you to change the font size (i.e, all fonts in Vim instance must be same size) it does allow you to apply special highlighting and/or a different font. To do this you could, e.g., simply make all Conceal text bold and underlined:
:highight Conceal gui=bold,underline cterm=bold,underline
You could also change the default colors:
:highight Conceal gui=bold,underline cterm=bold,underline guifg=yellow guibg=red ctermfg=yellow ctermbg=red
You can also change the font used by Conceal text. (Technically I think it is possible to specify a (bitmap) font of larger size, but that's not advised because it will screw up screen drawing):
:highight Conceal font=Monaco gui=bold,underline cterm=bold,underline guifg=yellow guibg=red ctermfg=yellow ctermbg=red