[Feature] Improve CJK support

[Mikachu2333]

As the following pic shows, it seems that /href command doesn't support Chinese correctly.

% !TeX encoding = UTF-8
% !TEX TS-program = xelatex
\documentclass[a4paper,oneside,onecolumn,12pt]{ctexrep}
\usepackage{ulem}
\usepackage[colorlinks=false,allbordercolors={0 0 0},pdfborderstyle={/S/U/W 1}]{hyperref}
\begin{document}
This is a line aims to test the support of href when linebreaking. \href{https://github.com/latex3/hyperref}{Test English linebreak.}

这是一行文字，目的是测试hyperref在CJK文字换行时的表现。\href{https://github.com/latex3/hyperref}{测试测试测试测试测试测试测试测试测试。}

\end{document}

[u-fischer]

You mean the line going through the text? That is more a xetex/xdvipdfmx problem than a hyperref problem. xdvipdfmx has its own ideas how to calculate the link area, with lualatex you would see something different.

You can try something like this to enlarge the area:

\documentclass[a4paper,oneside,onecolumn,12pt,fontset=fandol]{ctexrep} %fontset is needed for me on windows
\usepackage{ulem}
\usepackage[colorlinks=false,allbordercolors={0 0 0},pdfborderstyle={/S/U/W 1}]{hyperref}
\begin{document}
This is a line aims to test the support of href when linebreaking. \href{https://github.com/latex3/hyperref}{Test English linebreak.}

这是一行文字，目的是测试hyperref在CJK文字换行时的表现。\href{https://github.com/latex3/hyperref}{\special{pdf:xann width 0pt height 9pt depth 5pt}测试测试测试测试测试测\special{pdf:xann width 0pt height 9pt depth 5pt}试测试测试测试。}

\end{document}

[Mikachu2333]

Thank you very much for your prompt response! My doubts have finally been resolved!