Apply download priority immediately in torrent content view

Apply the new priority after picking it via drop-down menu.

Fixes #14667, #15238.
PR #15739.

Co-authored-by: a-sum-duma <68896601+a-sum-duma@users.noreply.github.com>
Co-authored-by: Chocobo1 <Chocobo1@users.noreply.github.com>

src/gui/properties/proplistdelegate.cpp

@@ -68,7 +68,8 @@ void PropListDelegate::setEditorData(QWidget *editor, const QModelIndex &index)
 
 QWidget *PropListDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &index) const
 {
-    if (index.column() != PRIORITY) return nullptr;
+    if (index.column() != PRIORITY)
+        return nullptr;
 
     if (m_properties)
     {
@@ -87,16 +88,21 @@ QWidget *PropListDelegate::createEditor(QWidget *parent, const QStyleOptionViewI
     editor->addItem(tr("Normal", "Normal (priority)"));
     editor->addItem(tr("High", "High (priority)"));
     editor->addItem(tr("Maximum", "Maximum (priority)"));
+
+    connect(editor, qOverload<int>(&QComboBox::currentIndexChanged), this, [this, editor]()
+    {
+        emit const_cast<PropListDelegate *>(this)->commitData(editor);
+    });
+
     return editor;
 }
 
 void PropListDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
 {
     const auto *combobox = static_cast<QComboBox *>(editor);
-    const int value = combobox->currentIndex();
 
     BitTorrent::DownloadPriority prio = BitTorrent::DownloadPriority::Normal; // NORMAL
-    switch (value)
+    switch (combobox->currentIndex())
     {
     case 0:
         prio = BitTorrent::DownloadPriority::Ignored; // IGNORED
@@ -109,8 +115,14 @@ void PropListDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
         break;
     }
 
-    model->setData(index, static_cast<int>(prio));
-    emit filteredFilesChanged();
+    const int newPriority = static_cast<int>(prio);
+    const int previousPriority = index.data(TorrentContentModel::UnderlyingDataRole).toInt();
+
+    if (newPriority != previousPriority)
+    {
+        model->setData(index, newPriority);
+        emit filteredFilesChanged();
+    }
 }
 
 void PropListDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &) const