Add xeCJKVerbAddon to default fvset config for Chinese documents

[zhsj]

Feature or Bugfix

• Bugfix

Purpose

Fixes: #9414

cc @stone-zeng @muzimuzhi

[tk0miya]

Is this fix a temporary workaround or a configuration? I'd like to know we can remove this setting in the future or not.

Additionally, it would be better to add a comment on what this setting doing to maintain the code.

[zhsj]

Is this fix a temporary workaround or a configuration? I'd like to know we can remove this setting in the future or not.

This is an old issue in xeCJK, which backs to 2017 (CTeX-org/ctex-kit#331). It's not easy to fix on xeCJK, as fancyvrb is not in kernel(not sure the translation, I don't know what's that mean, but it's said in xeCJK issue, in Chinese.) Maybe @stone-zeng(xeCJK maintainer) can add some context here.

This is a configuration which proposed by @stone-zeng in #9414 (comment)

[zhsj]

Additionally, it would be better to add a comment on what this setting doing to maintain the code.

done

[stone-zeng]

We may not patch fancyvrb packages etc in xeCJK recently, and even if the patch is added in the future, the settings here will still not be affected. So I think this pr is ok.

[tk0miya]

Thank you for explanation. Merging now.