Fix some compile error against qt6

lib/crop/cropwidget.cpp

@@ -24,7 +24,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #include <QApplication>
 #include <QCheckBox>
 #include <QComboBox>
-#include <QDesktopWidget>
+//#include <QDesktopWidget>
 #include <QDialogButtonBox>
 #include <QFontDatabase>
 #include <QHBoxLayout>

lib/document/documentjob.cpp

@@ -82,7 +82,11 @@ bool DocumentJob::checkDocumentEditor()
 
 void ThreadedDocumentJob::doStart()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QFuture<void> future = QtConcurrent::run(this, &ThreadedDocumentJob::threadedStart);
+#else
+    QFuture<void> future = QtConcurrent::run(&ThreadedDocumentJob::threadedStart, this);
+#endif
     auto watcher = new QFutureWatcher<void>(this);
     connect(watcher, SIGNAL(finished()), SLOT(emitResult()));
     watcher->setFuture(future);

lib/document/loadingdocumentimpl.cpp

@@ -157,7 +157,11 @@ struct LoadingDocumentImplPrivate {
             //   https://bugs.kde.org/show_bug.cgi?id=289819
             //
             mFormatHint = mMimeType.preferredSuffix().toLocal8Bit().toLower();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
             mMetaInfoFuture = QtConcurrent::run(this, &LoadingDocumentImplPrivate::loadMetaInfo);
+#else
+            mMetaInfoFuture = QtConcurrent::run(&LoadingDocumentImplPrivate::loadMetaInfo, this);
+#endif
             mMetaInfoFutureWatcher.setFuture(mMetaInfoFuture);
             break;
 
@@ -180,7 +184,11 @@ struct LoadingDocumentImplPrivate {
         Q_ASSERT(mMetaInfoLoaded);
         Q_ASSERT(mImageDataInvertedZoom != 0);
         Q_ASSERT(!mImageDataFuture.isRunning());
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         mImageDataFuture = QtConcurrent::run(this, &LoadingDocumentImplPrivate::loadImageData);
+#else
+        mImageDataFuture = QtConcurrent::run(&LoadingDocumentImplPrivate::loadImageData, this);
+#endif
         mImageDataFutureWatcher.setFuture(mImageDataFuture);
     }
 

lib/document/savejob.cpp

@@ -110,8 +110,11 @@ void SaveJob::doStart()
         emitResult();
         return;
     }
-
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QFuture<void> future = QtConcurrent::run(this, &SaveJob::saveInternal);
+#else
+    QFuture<void> future = QtConcurrent::run(&SaveJob::saveInternal, this);
+#endif
     d->mInternalSaveWatcher.reset(new QFutureWatcher<void>(this));
     connect(d->mInternalSaveWatcher.data(), &QFutureWatcherBase::finished, this, &SaveJob::finishSave);
     d->mInternalSaveWatcher->setFuture(future);

lib/mimetypeutils.h

@@ -21,11 +21,9 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #ifndef MIMETYPEUTILS_H
 #define MIMETYPEUTILS_H
 
-#include <QString>
+#include <QStringList>
 #include <lib/gwenviewlib_export.h>
 // Local
-class QStringList;
-
 class KFileItem;
 class KFileItemList;
 class QUrl;