Fix race condition in mermaid observer #32599
Merged
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This Pull Request addresses a race condition in the updateIframeHeight function where it is sometimes called when the iframe is not fully loaded or accessible resulting in an alarming error message for the user.
I have reproduced this here: https://gitea.com/small_world/MermaidTest/src/branch/main/
Please note: This error is reproducible but it happens intermittently.
To address this we: