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Fix mermaid flowchart margin issue (#27503) (#27516) 

Backport https://github.com/go-gitea/gitea/pull/27503 to 1.21

Fixes: https://github.com/go-gitea/gitea/issues/27435
Related: https://github.com/mermaid-js/mermaid/issues/4907

<img width="924" alt="image"

src="https://github.com/go-gitea/gitea/assets/115237/494a1d2e-4c56-48d0-9843-82a5e5aa977e">
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silverwind 2023-10-08 15:31:47 +02:00 committed by GitHub
parent 8e1ef5787f
commit 0fb7294027
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web_src/js/markup/mermaid.js
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@ -4,9 +4,11 @@ import {displayError} from './common.js';
const {mermaidMaxSourceCharacters} = window.config;
// margin removal is for https://github.com/mermaid-js/mermaid/issues/4907
const iframeCss = `:root {color-scheme: normal}
body {margin: 0; padding: 0; overflow: hidden}
#mermaid {display: block; margin: 0 auto}`;
#mermaid {display: block; margin: 0 auto}
blockquote, dd, dl, figure, h1, h2, h3, h4, h5, h6, hr, p, pre {margin: 0}`;
export async function renderMermaid() {
const els = document.querySelectorAll('.markup code.language-mermaid');