Qt: Resize fixed columns on theme change

Fixes columns being too small after change on MacOS.

src/duckstation-qt/gamelistwidget.cpp

@@ -1469,6 +1469,9 @@ void GameListWidget::cancelRefresh()
 void GameListWidget::onThemeChanged()
 {
   m_model->reloadThemeSpecificImages();
+
+  // Resize columns, since the text size can change with themes.
+  m_list_view->updateFixedColumnWidths();
 }
 
 void GameListWidget::setBackgroundPath(const std::string_view path)
@@ -1856,7 +1859,7 @@ GameListListView::GameListListView(GameListModel* model, GameListSortModel* sort
   QHeaderView* const horizontal_header = horizontalHeader();
   horizontal_header->setHighlightSections(false);
   horizontal_header->setContextMenuPolicy(Qt::CustomContextMenu);
-  setFixedColumnWidths();
+  updateFixedColumnWidths();
 
   horizontal_header->setSectionResizeMode(GameListModel::Column_Title, QHeaderView::Stretch);
   horizontal_header->setSectionResizeMode(GameListModel::Column_FileTitle, QHeaderView::Stretch);
@@ -1921,7 +1924,7 @@ void GameListListView::setFixedColumnWidth(const QFontMetrics& fm, int column, i
   setFixedColumnWidth(column, width);
 }
 
-void GameListListView::setFixedColumnWidths()
+void GameListListView::updateFixedColumnWidths()
 {
   const QFontMetrics fm = fontMetricsForHorizontalHeader();
   const auto width_for = [&fm](const QString& text) { return fm.size(0, text).width(); };

src/duckstation-qt/gamelistwidget.h

@@ -176,6 +176,7 @@ public:
   QFontMetrics fontMetricsForHorizontalHeader() const;
   void setFixedColumnWidth(const QFontMetrics& fm, int column, int str_width);
   void setAndSaveColumnHidden(int column, bool hidden);
+  void updateFixedColumnWidths();
 
   void adjustIconSize(int delta);
 
@@ -184,7 +185,6 @@ protected:
 
 private:
   void setFixedColumnWidth(int column, int width);
-  void setFixedColumnWidths();
 
   void loadColumnVisibilitySettings();
   void loadColumnSortSettings();