Minipage content overlaps with text before that if nccmath is used

Question

It seems that if the nccmath package is included, then the text in the following minipage overlaps with the text before that if the minipage contains only display math. The \FixMinipageForNccmath macros is from nccmath affecting minipage widths.

\documentclass[fleqn,preview=false]{standalone}%
%
\usepackage{amsmath}%
\usepackage{nccmath}% Needed for fleqn environment

\newcommand*{\FixMinipageForNccmath}{\hrule height 0pt width \hsize}%

\begin{document}
Some text: $2 \ln x = 1$

\begin{minipage}{0.70\linewidth}\FixMinipageForNccmath
\begin{align*}
       \ln x &= \frac{1}{2}
\end{align*}
\end{minipage}
\begin{minipage}{0.30\linewidth}\FixMinipageForNccmath
    Note: abcd
\end{minipage}
\end{document}

It seems that nccmath has serious bugs. The \hrule has no influence, as you probably have already noticed. — egreg, Jul 02 '11 at 19:44
Yeah, that is why I posted to see if there is a replacement package for nccmath — Peter Grill, Jul 02 '11 at 19:46
@egreg: It seems if I just use \newcommand*{\FixMinipageForNccmath}{\leavevmode} both of the recent problems get fixed. I don't quite understand what other impacts this would have but got the idea from this recent question about aligning minipages — Peter Grill, Jul 02 '11 at 20:14
@egreg: If you post your comment as an answer I'll accept it so we can move this to answered. — Peter Grill, Sep 12 '11 at 18:11
@PeterGrill: What about using etoolbox and \BeforeBeginEnvironment{minipage}{\leavevmode}? — Bernard, May 10 '14 at 23:45
@Bernard: Yep, as per my comment above that was the solution I was using, but I then have since moved on from nccmath. — Peter Grill, May 10 '14 at 23:49
@Peter Grill: not sure to get all. You mean using etoolbox &c. provides a solution, at least to the minipage problem? — Bernard, May 10 '14 at 23:53
@Bernard: I believe that it did, but I think I was only applying it if needed, not applying it to all minipages. — Peter Grill, May 11 '14 at 00:15
@Peter Grill:Do you think adding to nccmath this simple patch to minipage could be harmful in any way? I don't know enough of the internals of LaTeX to have an opinion. — Bernard, May 11 '14 at 00:21
@Bernard: This is an issue from 2.5 years ago and I don't fully remember the details. Also, I don't know the TeX internals so am not qualified to comment on that. Perhaps you should post a new question and get info from those who really understand this. I have moved on from nccmath and am no longer using it. I just point out the problems I encountered in case those using it also run into the same problems. — Peter Grill, May 11 '14 at 00:28

score 3 · Accepted Answer · answered Sep 12 '11 at 19:00

3

It seems that nccmath has serious bugs. The \hrule has no influence, as you probably have already noticed.

answered Sep 12 '11 at 19:00

egreg

1,121,712

score 2 · Answer 2 · answered Feb 27 '21 at 09:56

The bug is due to \NCC@ignorepar command in nccmath package:

"This command removes extra vertical space before display formula if it starts from a new paragraph and changes the beforeskip to \abovedisplayshortskip if the \useshortskip command was applied."

\let \NCC@ignorepar=\relax should fix the problem.

Minipage content overlaps with text before that if nccmath is used

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