Unexpected HTML paste when copying code from Gitea

通过复制链接的 Gitea 源文件中的代码并将其粘贴到 GitHub 评论框中来重现该问题。首先跟踪 repository 的剪贴板和粘贴处理入口；当粘贴结果只包含纯文本代码而不是损坏的 HTML 时，即表示完成。

Open this source file, select all code lines, copy them
Paste into GitHub comment box
Pasted content is completely mangled. Paste result below. Expectation would be to only paste the plaintext parts of the clipboard data.

{
--


<code class="code-inner"><span class="p">}</span>
</code>

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