Fix porting bug regarding the font extraction progress

BUGS: 375782

core/document.cpp

@@ -1422,7 +1422,7 @@ void DocumentPrivate::rotationFinished( int page, Okular::Page *okularPage )
         o->notifyPageChanged( page, DocumentObserver::Pixmap | DocumentObserver::Annotations );
 }
 
-void DocumentPrivate::fontReadingProgress( int page )
+void DocumentPrivate::slotFontReadingProgress( int page )
 {
     emit m_parent->fontReadingProgress( page );
 
@@ -2800,7 +2800,7 @@ void Document::startFontReading()
 
     d->m_fontThread = new FontExtractionThread( d->m_generator, pages() );
     connect( d->m_fontThread, SIGNAL(gotFont(Okular::FontInfo)), this, SLOT(fontReadingGotFont(Okular::FontInfo)) );
-    connect( d->m_fontThread.data(), &FontExtractionThread::progress, this, &Document::fontReadingProgress );
+    connect( d->m_fontThread.data(), SIGNAL(progress(int)), this, SLOT(slotFontReadingProgress(int)) );
 
     d->m_fontThread->startExtraction( /*d->m_generator->hasFeature( Generator::Threaded )*/true );
 }

core/document.h

@@ -1117,7 +1117,7 @@ class OKULARCORE_EXPORT Document : public QObject
         Q_PRIVATE_SLOT( d, void slotTimedMemoryCheck() )
         Q_PRIVATE_SLOT( d, void sendGeneratorPixmapRequest() )
         Q_PRIVATE_SLOT( d, void rotationFinished( int page, Okular::Page *okularPage ) )
-        Q_PRIVATE_SLOT( d, void fontReadingProgress( int page ) )
+        Q_PRIVATE_SLOT( d, void slotFontReadingProgress( int page ) )
         Q_PRIVATE_SLOT( d, void fontReadingGotFont( const Okular::FontInfo& font ) )
         Q_PRIVATE_SLOT( d, void slotGeneratorConfigChanged( const QString& ) )
         Q_PRIVATE_SLOT( d, void refreshPixmaps( int ) )

core/document_p.h

@@ -150,7 +150,7 @@ class DocumentPrivate
         void slotTimedMemoryCheck();
         void sendGeneratorPixmapRequest();
         void rotationFinished( int page, Okular::Page *okularPage );
-        void fontReadingProgress( int page );
+        void slotFontReadingProgress( int page );
         void fontReadingGotFont( const Okular::FontInfo& font );
         void slotGeneratorConfigChanged( const QString& );
         void refreshPixmaps( int );