fix: When previewing some SVG, 'btoa' report error: The string to be encoded contains characters outside of the Latin1 range."

[XinRoom]

When previewing some SVG, report error:
viewer-main.mjs?v=79b66689-10:588 Error evaluating async computed property: Error: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

report error example:

btoa(`<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg">
    <defs>
        <pattern name="中文" id="smallGrid" width="10" height="10" patternUnits="userSpaceOnUse">
            <path d="M 10 0 L 0 0 0 10" fill="none" stroke="gray" stroke-width="0.5"/>
        </pattern>
        <pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse">
            <rect width="100" height="100" fill="url(#smallGrid)"/>
            <path d="M 100 0 L 0 0 0 100" fill="none" stroke="gray" stroke-width="1"/>
        </pattern>
    </defs>
    <rect width="100%" height="100%" fill="url(#grid)" />
</svg>`)

fix by btoa(unescape(encodeURIComponent(data)))

ref: https://stackoverflow.com/questions/23223718/failed-to-execute-btoa-on-window-the-string-to-be-encoded-contains-characte

[skjnldsv]

/backport to stable29

[skjnldsv]

/backport to stable30

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[skjnldsv]

/backport to stable29

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/2432/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick ca07f155

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/2432/stable29

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/2432/stable29."}

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.