DlgCoverArtFullSize: copy fetched cover by value

Co-authored-by: Daniel Schürmann <daschuer@mixxx.org>

Author: ronso0

src/library/dlgcoverartfullsize.cpp

@@ -85,8 +85,8 @@ void DlgCoverArtFullSize::init(TrackPointer pTrack) {
     slotLoadTrack(pTrack);
 }
 
-void DlgCoverArtFullSize::initFetchedCoverArt(const QPixmap& pixmap) {
-    m_pixmap = pixmap;
+void DlgCoverArtFullSize::initFetchedCoverArt(QPixmap pixmap) {
+    m_pixmap = std::move(pixmap);
 
     // The real size will be calculated later by adjustImageAndDialogSize().
     resize(100, 100);

src/library/dlgcoverartfullsize.h

@@ -24,7 +24,7 @@ class DlgCoverArtFullSize
     ~DlgCoverArtFullSize() override = default;
 
     void init(TrackPointer pTrack);
-    void initFetchedCoverArt(const QPixmap& fetchedCoverArtBytes);
+    void initFetchedCoverArt(QPixmap pixmap);
     void mousePressEvent(QMouseEvent* event) override;
     void mouseReleaseEvent(QMouseEvent* ) override;
     void mouseMoveEvent(QMouseEvent* ) override;