[EBook Thumb] Percent-decode image href URL

The href may contain percent-encoded characters (e.g. spaces),
decode these properly.

thumbnail/ebookcreator.cpp

@@ -24,6 +24,7 @@
 #include <QImage>
 #include <QMap>
 #include <QMimeDatabase>
+#include <QUrl>
 #include <QXmlStreamReader>
 
 #include <KZip>
@@ -207,6 +208,10 @@ bool EbookCreator::createEpub(const QString &path, QImage &image)
         return false;
     }
 
+    // Decode percent encoded URL
+    QByteArray encoded = itemHrefs[coverId].toUtf8();
+    coverHref = QUrl::fromPercentEncoding(encoded);
+
     // Make coverHref relative to OPF location
     const int lastOpfSlash = opfPath.lastIndexOf(QLatin1Char('/'));
     if (lastOpfSlash > -1) {