Drop Qt 5 support

Qt 6 has been available for almost 4 years. Qt 5 is no longer officially supported by Qt for opensource, it's time to drop Qt 5.

src/collection/collection.cpp

@@ -192,11 +192,7 @@ void SCollection::ReloadSettings() {
 
 void SCollection::SyncPlaycountAndRatingToFilesAsync() {
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   (void)QtConcurrent::run(&SCollection::SyncPlaycountAndRatingToFiles, this);
-#else
-  (void)QtConcurrent::run(this, &SCollection::SyncPlaycountAndRatingToFiles);
-#endif
 
 }
 

src/collection/collectionfilter.cpp

@@ -60,11 +60,7 @@ bool CollectionFilter::filterAcceptsRow(const int source_row, const QModelIndex
     return item->type == CollectionItem::Type::LoadingIndicator;
   }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   size_t hash = qHash(filter_string_);
-#else
-  uint hash = qHash(filter_string_);
-#endif
   if (hash != query_hash_) {
     FilterParser p(filter_string_);
     filter_tree_.reset(p.parse());

src/collection/collectionfilter.h

@@ -51,11 +51,7 @@ class CollectionFilter : public QSortFilterProxyModel {
 
  private:
   mutable QScopedPointer<FilterTree> filter_tree_;
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   mutable size_t query_hash_;
-#else
-  mutable uint query_hash_;
-#endif
   QString filter_string_;
 };
 

src/collection/collectionmodel.cpp

@@ -813,11 +813,7 @@ CollectionItem *CollectionModel::CreateCompilationArtistNode(CollectionItem *par
 
 void CollectionModel::LoadSongsFromSqlAsync() {
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   QFuture<SongList> future = QtConcurrent::run(&CollectionModel::LoadSongsFromSql, this, options_active_.filter_options);
-#else
-  QFuture<SongList> future = QtConcurrent::run(this, &CollectionModel::LoadSongsFromSql, options_active_.filter_options);
-#endif
   QFutureWatcher<SongList> *watcher = new QFutureWatcher<SongList>();
   QObject::connect(watcher, &QFutureWatcher<void>::finished, this, &CollectionModel::LoadSongsFromSqlAsyncFinished);
   watcher->setFuture(future);
@@ -1435,17 +1431,15 @@ QString CollectionModel::DividerDisplayText(const GroupBy group_by, const QStrin
 
 bool CollectionModel::CompareItems(const CollectionItem *a, const CollectionItem *b) const {
 
-  QVariant left(data(a, CollectionModel::Role_SortText));
-  QVariant right(data(b, CollectionModel::Role_SortText));
+  QVariant left = data(a, CollectionModel::Role_SortText);
+  QVariant right = data(b, CollectionModel::Role_SortText);
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-  if (left.metaType().id() == QMetaType::Int)
-#else
-  if (left.type() == QVariant::Int)
-#endif
+  if (left.metaType().id() == QMetaType::Int) {
     return left.toInt() < right.toInt();
-  else
+  }
+  else {
     return left.toString() < right.toString();
+  }
 
 }
 

src/collection/collectionquery.cpp

@@ -76,20 +76,10 @@ void CollectionQuery::AddWhere(const QString &column, const QVariant &value, con
   }
   else {
     // Do integers inline - sqlite seems to get confused when you pass integers to bound parameters
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     if (value.metaType().id() == QMetaType::Int) {
-#else
-    if (value.type() == QVariant::Int) {
-#endif
       where_clauses_ << QStringLiteral("%1 %2 %3").arg(column, op, value.toString());
     }
-    else if (
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-      value.metaType().id() == QMetaType::QString
-#else
-      value.type() == QVariant::String
-#endif
-      && value.toString().isNull()) {
+    else if (value.metaType().id() == QMetaType::QString && value.toString().isNull()) {
       where_clauses_ << QStringLiteral("%1 %2 ?").arg(column, op);
       bound_values_ << QLatin1String("");
     }

src/collection/collectionview.cpp

@@ -459,11 +459,7 @@ void CollectionView::contextMenuEvent(QContextMenuEvent *e) {
   action_copy_to_device_->setVisible(regular_elements == regular_editable);
 #endif
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
   action_delete_files_->setVisible(delete_files_);
-#else
-  action_delete_files_->setVisible(false);
-#endif
 
   action_show_in_various_->setVisible(songs_selected > 0);
   action_no_show_in_various_->setVisible(songs_selected > 0);
@@ -474,11 +470,7 @@ void CollectionView::contextMenuEvent(QContextMenuEvent *e) {
   action_copy_to_device_->setEnabled(regular_elements == regular_editable);
 #endif
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
   action_delete_files_->setEnabled(delete_files_);
-#else
-  action_delete_files_->setEnabled(false);
-#endif
 
   context_menu_->popup(e->globalPos());
 
@@ -523,11 +515,7 @@ void CollectionView::SetShowInVarious(const bool on) {
     }
   }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
   const QSet<QString> albums_set = QSet<QString>(albums.keyBegin(), albums.keyEnd());
-#else
-  const QSet<QString> albums_set = QSet<QString>::fromList(albums.keys());
-#endif
   for (const QString &album : albums_set) {
     app_->collection_backend()->ForceCompilation(album, albums.values(album), on);
   }