Matt Huszagh writes:
I couldn't get ~org--match-text-baseline-ascent~ to compute the ascent : the ~xml-get-attribute~ call returns : ("-16.945024" "12.153473" "16.148855" "8.064997") which gives an ascent < -100, and the code then defaults to 'center.I'd need to know more about your setup for generating latex fragments. Did you follow all the directions in org--match-text-baseline-ascent? How is your org-format-latex-header set? In particular, are you using \documentclass[preview]{standalone}? If you can provide me with the TeX file used to generate the fragment, as well as the SVG file you get as a result, that would be helpful too.
My mistake. For some reason, I had thought that
=\documentclass[preview]{standalone}= was used by default for LaTeX
previews. Setting it as described in your patch, it now works
properly, even with the default value of =dvisvgm=.If there are no drawbacks, perhaps this behaviour should be the default. Otherwise, it should at least be easier to toggle.I didn't attempt to make this the default because it requires a specific setup, which is also different from the current default setup in other respects. Most importantly, it requires using the standalone document class, though I believe article is used at the moment.
To make this behavior easier to toggle, you could 1. Change the default value of =org-format-latex-header=. The =standalone= class makes sense, but I don't know if that might break things. 2. Specify the =:latex-header= of the default =dvisvgm= option. Same caveat applies. 3. Add a =dvisvgm-with-ascent= option to the default value of =org-preview-latex-process-alist=. Instead of the new variable =org-latex-fragment-overlay-ascent=, perhaps the function used to compute the ascent could be provided as another property, such as =:ascent=, added to the relevant options in =org-preview-latex-process-alist=. It seems to make more sense since it only applies to svg output, and it makes it easier to have this behavior as default. It would require =org--make-preview-overlay= to take the ascent as an additional argument. Please note that I am not a maintainer, these are just a few thoughts. I do hope your work can be applied and that LaTeX fragments can be properly aligned by default. You should add [PATCH] to the subject of your mail, so that it gets listed at https://updates.orgmode.org/ and not forgotten. A maintainer will reply eventually, but it might take up to a few months. Regards, -- Sébastien Miquel
