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FXL: don't use book viewport if it's empty
Fixes https://github.com/johnfactotum/foliate-js/issues/52#issuecomment-2956113877
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@@ -18,7 +18,7 @@ const getViewport = (doc, viewport) => {
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// fallback to book's viewport
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// fallback to book's viewport
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if (typeof viewport === 'string') return parseViewport(viewport)
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if (typeof viewport === 'string') return parseViewport(viewport)
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if (viewport) return viewport
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if (viewport?.width && viewport.height) return viewport
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// if no viewport (possibly with image directly in spine), get image size
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// if no viewport (possibly with image directly in spine), get image size
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const img = doc.querySelector('img')
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const img = doc.querySelector('img')
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