Hi luatex developers,
I want to ask your opinion about new hook (token list) "\everypredisplay".
This should work just before $$ (display start) while math group is not
started. There is \everydisplay but it works immediately after math mode
start.
Why one would need it?
Now there is now how to control spaces between to equations.
Lets say journal requires spaces around displays (and in display inner
lines) and text 6pt.
I can do with tex macros by hooking into every latex display
environment and putting some code right before $$.
In that code I add \par; then I do manipulations
of \abovedisplayskip by checking \lastskip; and controling \panalty by
looking at \prevgraf. Finaly I add \noindent to remove empty boxes.
Everything is perfect while I do not get plain display makros $$ a+b $$.
Manualy to retype them is not an option. So the hook of \everypredisplay
where \par could work would be very useful.
What do you think?
I'm using luatex 1.09.2.
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