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The renderer's PDF export fallback uses window.open('', '_blank')
to open a blank window that is then navigated to a Blob URL.
Electron's setWindowOpenHandler only allowed blob: and od: protocols,
so about:blank was denied and the user saw a "Popup blocked" alert.
Fix: add about:blank to the allowed child window URL whitelist.
Co-authored-by: Ken <hitken@users.noreply.github.com>