Fix narrowing conversions

src/covermanager/albumcoverexporter.cpp

@@ -45,15 +45,17 @@ void AlbumCoverExporter::SetDialogResult(const AlbumCoverExport::DialogResult &d
 
 void AlbumCoverExporter::AddExportRequest(const Song &song) {
   requests_.append(new CoverExportRunnable(dialog_result_, song));
-  all_ = requests_.count();
+  all_ = static_cast<int>(requests_.count());
 }
 
 void AlbumCoverExporter::Cancel() { requests_.clear(); }
 
 void AlbumCoverExporter::StartExporting() {
+
   exported_ = 0;
   skipped_ = 0;
   AddJobsToPool();
+
 }
 
 void AlbumCoverExporter::AddJobsToPool() {
@@ -70,13 +72,17 @@ void AlbumCoverExporter::AddJobsToPool() {
 }
 
 void AlbumCoverExporter::CoverExported() {
-  exported_++;
+
+  ++exported_;
   emit AlbumCoversExportUpdate(exported_, skipped_, all_);
   AddJobsToPool();
+
 }
 
 void AlbumCoverExporter::CoverSkipped() {
-  skipped_++;
+
+  ++skipped_;
   emit AlbumCoversExportUpdate(exported_, skipped_, all_);
   AddJobsToPool();
+
 }