等式下方留出空格并对齐

Question

useshortskip手动nccmath调整上方空间align但不调整下方空间align。以下示例在第 1 页和第 2 页中产生不同的结果。

\documentclass{article}

\usepackage{amsmath,nccmath}

\begin{document}
hello. hello. hello. hello.
\begin{equation}
y=x.
\end{equation}
hello. hello. hello. hello. hello. hello. hello. hello.\clearpage

hello. hello. hello. hello.\useshortskip
\begin{align}
y=x.
\end{align}
%%%%%%%%%%%HOW CAN I ADJUST THIS SPACE?%%%%%%%%%%%
hello. hello. hello. hello. hello. hello. hello. hello.

\end{document}

我该如何控制后面的空间？我尝试在后面align应用，但这种方式留下了一个与前面的空间不同的非常狭窄的空间。align\end{align}\end{equation}

附言amsmath-重新定义对齐以支持\abovedisplayshortskip 和 \belowdisplayshortskip？显示了一些解决方案。

\documentclass{article}

\usepackage{amsmath,nccmath}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{xpatch}
\makeatletter
    \xpatchcmd
        {\NCC@ignorepar}
        {\global}
        {\belowdisplayskip\belowdisplayshortskip\global}
        {}
        {}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
hello. hello. hello. hello.
\begin{equation}
y=x.
\end{equation}
hello. hello. hello. hello. hello. hello. hello. hello.\clearpage

hello. hello. hello. hello.\useshortskip
\begin{align}
y=x.
\end{align}
hello. hello. hello. hello. hello. hello. hello. hello.

\end{document}