TeX input: improve heuristics for invisible apply

[pkra]

From the discussion at #1305 (comment)

The TeX input jax does put invisible times following things like \sin and \dim, but only in certain circumstances, and (unfortunately) that doesn't currently include when \dim is followed by another operator. The heuristic for adding invisible times could be altered to include more situations, and probably should.

[physikerwelt]

I think we should collect some reasonable testcases:

\arcsin\sin\phi
\operatorname{x}\operatorname{y}

[dpvc]

You also want

\sin\left(x\right)

as a test case (it doesn't currently get the function apply).

[dpvc]

The issue1312 branch of my fork of MathJax implements an improved algorithm for adding the invisible function apply operation, and it does handle the three cases shown above.

[dpvc]

=> Merged.

[dpvc]

=> In testsuite

LaTeXToMathML/issue1312.html

[physikerwelt]

@dpvc Yes it works great. I did already cherry pick your change to mathoid.

[physikerwelt]

@dpvc have a look at http://math.beta.wmflabs.org:8080/wiki/User:Admin

[physikerwelt]

... oh I see the space between \dim \mathrm{im}(f) is still missing... It sems that I did not check carefully enough this morning

[dpvc]

OK, I added some more changes that should handle this and some other situations in the issue1312 branch of my fork of MathJax.

More test cases:

\dim\mathrm{im}(f)
\dim\begin{vmatrix}x\end{vmatrix}

[physikerwelt]

lgtm http://math.beta.wmflabs.org:8080/wiki/User:Admin

[dpvc]

=> Merged

[dpvc]

Test updated to include new cases.