Allow setting priority for partially downloaded multi-file torrent

Currently you can't directly change the priority of a partially completed multi file torrent. You'll have to start downloading those files and then change their priority.

Closes #10994.
Closes #8673.
PR #16546.

src/gui/properties/propertieswidget.cpp

@@ -655,8 +655,6 @@ void PropertiesWidget::displayFilesListMenu()
         menu->addSeparator();
     }
 
-    if (!m_torrent->isSeed())
-    {
     const auto applyPriorities = [this](const BitTorrent::DownloadPriority prio)
     {
         const QModelIndexList selectedRows = m_ui->filesList->selectionModel()->selectedRows(0);
@@ -725,7 +723,6 @@ void PropertiesWidget::displayFilesListMenu()
             this->applyPriorities();
         }
     });
-    }
 
     // The selected torrent might have disappeared during exec()
     // so we just close menu when an appropriate model is reset

src/gui/properties/proplistdelegate.cpp

@@ -77,7 +77,7 @@ QWidget *PropListDelegate::createEditor(QWidget *parent, const QStyleOptionViewI
     if (m_properties)
     {
         const BitTorrent::Torrent *torrent = m_properties->getCurrentTorrent();
-        if (!torrent || !torrent->hasMetadata() || torrent->isSeed())
+        if (!torrent || !torrent->hasMetadata())
             return nullptr;
     }