[Libreoffice-bugs] [Bug 114493] In Math Formula the spacing around operators, numbers, identifiers etc should be adjustable

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=114493

--- Comment #2 from Vladislav Ivanistsev <vi at ut.ee> ---
Sure, one can use "`" or "~". 

Yet, take a look on the implementation in mathml. For the mo element there is
an "lspace" and "rspace" parameters. Both depend on the form of an element --
prefix (eg "("), infix (eg "+") or postfix (eg ")".

Your solution is equivalent of adding manually mspace element in mathml. A more
elegant solution rely of the https://www.w3.org/TR/mathml-for-css/#mo, where
several types are defined:

mi      identifier
mn      number
mo      operator, fence or separator
mtext   text
mspace  space
ms      string literal

Using these types it is possible to define and redefine difference space values
in a more flexible way than it is currently done in LO formula editor.

Herewith, padding is set only in the following cases:
mo[largeop="true"]
        {font-size:1.3em;
        vertical-align:-0.1ex;}
mo[form="infix"], * + mo
        {padding:0 0.3ex;}
mo[form="prefix"]
        {padding:0 0 0 0.5ex;}
mo[form="postfix"]
        {padding:0 0.5ex 0 0;}
mo[fence="true"], mo[separator="true"]
        {padding:0;}

I propose distinguishing fences and separators from other operators, and allow
adjusting space around them in a separate way.

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