Re: ox-latex: help: LATEX_HEADER from different subtrees collision

[pinmacs <pinmacs@cas.cat>]

Hey!

And this is trivial, but it took me a while to figure it out

Of course, if you want to use more than one EXPORT_LATEX_HEADER for that 
subtree export, you need to use multi-value property [0]:

:PROPERTIES:
:EXPORT_LATEX_HEADER: \usepackage{bookmark}
:EXPORT_LATEX_HEADER+: \usepackage{nopageno}
:EXPORT_LATEX_HEADER+: \usepackage{siunitx}
:EXPORT_LATEX_HEADER+: \usepackage{colortbl}
:EXPORT_LATEX_HEADER+: \usepackage{xcolor}
:EXPORT_LATEX_HEADER+: \usepackage[a4paper, margin=3cm]{geometry}
:EXPORT_LATEX_HEADER+: \usepackage[none]{hyphenat}
:END:

Debugging [1] I also found that once there is one property 
EXPORT_LATEX_HEADER, subsequent `#+LATEX_HEADER` are ignored, that's smart!

Cheers,
pinmacs

[0]
   If you want to add to the value of an existing property, append a ‘+’ 
to the property name. The following results in the property ‘var’ having 
the value ‘foo=1 bar=2’.

   #+PROPERTY: var  foo=1
   #+PROPERTY: var+ bar=2

   src https://orgmode.org/manual/Property-Syntax.html


[1] near the .pdf you have the .tex to debug, and you can export again 
outside emacs with ~pdflatex~