On 4/30/2018 6:50 PM, Ulrike Fischer wrote:
In the following document the second a is much nearer placed to the

$V \mathbin{a} W \qquad V \mathbin{\mathbin{a}} W $

(in the second case an italic kern seems to be missing)

Can one avoid this side effect of nested \math-command? When
building symbols it is not always easy to avoid such nestings.
this is again a side effect of bad glyph boundingboxes

anyway, the tex engine collapses nested ord nodes so i generalized that in the upcoming engine

\mathflattenmode \numexpr
    0  % off
 +  1  % ord
 +  2  % bin
 +  4  % rel
 +  8  % punct
 + 16  % inner

so you can get rid of nested same-class (actually this is only done when no super or subscript) .. as a side effect you get a sequence of math char nodes and that will then listen to the other italics enforcing flag (for fonts with weird character boundingboxes)

i didn't test side effects but at least we can influence it (the default is of course 1 which is what tex naturally does)


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