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Fix scroll over mermaid frame (#21925)

When starting a scroll while the mouse is over a mermaid diagram, the
scroll sometimes propagates to the iframe, preventing the parent page
from scrolling. Fix this by disabling scroll inside the iframe. This is
not a problem because those frames are never meant to scroll. Bug seems
to affect Firefox only.


![scroll](https://user-images.githubusercontent.com/115237/203847578-6831e3c8-9df4-4577-8501-822fb9ea1278.gif)
pull/21879/merge
silverwind 5 days ago committed by GitHub
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  1. 2
      web_src/js/markup/mermaid.js

2
web_src/js/markup/mermaid.js

@ -3,7 +3,7 @@ const {mermaidMaxSourceCharacters} = window.config;
const iframeCss = `
:root {color-scheme: normal}
body {margin: 0; padding: 0}
body {margin: 0; padding: 0; overflow: hidden}
#mermaid {display: block; margin: 0 auto}
`;

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