TOC button disappears in snippets when switching back from Code to Preview
### Summary On a snippet containing a Markdown file, switching from the Preview tab to the Code tab and back, the TOC (Table of Contents) button disappears. It reappears on page reload. ![snippet-toc-gone](/uploads/6ab9cda1cb6196bbd69975f00f433f44/snippet-toc-gone.mov){width=450 height=291} This does not reproduce in a repository file preview. ### Steps to reproduce 1. Create a snippet with a Markdown file that contains headings. 1. Confirm the TOC button is visible on the Preview tab. 1. Switch to the Code tab. 1. Switch back to the Preview tab. ### What is the current *bug* behavior? The TOC button disappears. ### What is the expected *correct* behavior? The TOC button remains visible after switching back to Preview. ### Output of checks This bug happens on GitLab.com
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