game_list: discover loose dumps without walking their RomFS payloads

Defer RomFS construction, reuse one discovery result, omit recursive folder sizing, and release rows discarded by cancellation. Add scan suspension and regression coverage for extracted layouts and Unicode paths.

Assisted-by: Codex (implementation, selective integration and automated validation)

1 files changed, 18 insertions, 3 deletions

diff --git a/src/qt_common/game_list/model.cpp b/src/qt_common/game_list/model.cpp
index 4f3916b04d..23d8ec1f43 100644
--- a/src/qt_common/game_list/model.cpp
+++ b/src/qt_common/game_list/model.cpp
@@ -44,9 +44,21 @@ GameListModel::GameListModel(std::shared_ptr<FileSys::VfsFilesystem> vfs_,
     setSortRole(GameListItemPath::SortRole);
 }
 
-GameListModel::~GameListModel() = default;
+GameListModel::~GameListModel() {
+    StopWorker();
+}
+
+void GameListModel::SetScanEnabled(bool enabled) {
+    scan_enabled = enabled;
+    if (!enabled) {
+        StopWorker();
+    }
+}
 
 void GameListModel::PopulateAsync(QVector<UISettings::GameDir>& game_dirs) {
+    if (!scan_enabled || system.IsPoweredOn()) {
+        return;
+    }
     emit PopulatingStarted();
 
     StopWorker();
@@ -62,11 +74,14 @@ void GameListModel::PopulateAsync(QVector<UISettings::GameDir>& game_dirs) {
 }
 
 void GameListModel::WorkerEvent() {
-    current_worker->ProcessEvents(this);
+    if (current_worker) {
+        current_worker->ProcessEvents(this);
+    }
 }
 
 void GameListModel::AddDirEntry(GameListDir* entry_items) {
     if (m_flat) {
+        delete entry_items;
         return;
     }
     invisibleRootItem()->appendRow(entry_items);
@@ -172,7 +187,7 @@ void GameListModel::StopWorker() {
 void GameListModel::Repopulate() {
     // CreateFactories replaces the content providers a running game reads from. Stopping
     // emulation repopulates the list anyway, so skip watcher-driven reloads until then.
-    if (QtCommon::system->IsPoweredOn()) {
+    if (!scan_enabled || QtCommon::system->IsPoweredOn()) {
         LOG_INFO(Frontend, "Emulation is running, deferring game list reload.");
         return;
     }