VFS perf fixes, icon/stylesheet compat, download filename fix

VFS:
- Open backing fd at mo2_open time for read-only handles so mo2_read can
  splice without re-opening the file on every read call.
- Bump RLIMIT_NOFILE at mount time to fit the resulting fd pressure when
  the game keeps hundreds of BSAs open.
- Dedicated node_cache_mutex so resolveByInode / mo2_lookup stop racing
  unordered_map writes while multiple tree_mutex readers are active.
- max_read=1MB + matching conn->max_read and raised max_readahead/max_write
  so the kernel merges Wine's small sequential reads into bigger FUSE
  requests.
- Per-op wall-clock counters in mo2_init() logs so we can distinguish VFS
  latency from game-side work.

Proton launch:
- Write dxvk.conf to the prefix and set DXVK_CONFIG_FILE to force
  dxvk.enableGraphicsPipelineLibrary=False, avoiding long GPL compile
  stalls on first run.

UI / plugin compat:
- Clamp IconDelegate's per-icon width to [8, 16] so narrow content
  columns don't trigger QIcon::pixmap(0,0) returning null and logging
  "failed to load icon" every repaint.
- Pre-create lowercase symlinks in the stylesheet directory so QSS files
  authored on Windows resolve url(foo.svg) when on-disk files are Foo.svg.
- Flip content icons empty-chessboard.png and facegen.png to 8-bit RGBA
  so Qt's built-in PNG reader loads them uniformly.
- Add mobase.Version.canonicalString shim for legacy Python plugins that
  still call the old VersionInfo method on appVersion()'s return.
- BSPluginList: compare normalized plugin name lists instead of byte
  hashes so the post-run case-fix refresh stops spuriously firing the
  "load order changed" dialog.
- BSPluginList disabled by default.

Download manager:
- Parse CDN URL with QUrl + QUrlQuery and read the filename from the
  response-content-disposition query param (RFC 6266 quoted / unquoted /
  ext-value forms), not QFileInfo on the raw URL.
- When the API or URL gives us a CDN object key (no archive extension),
  prefer the actual Content-Disposition header from the live response in
  metaDataChanged and downloadFinished.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/BSPluginList/PluginListView.h b/libs/installer_bsplugins/src/BSPluginList/PluginListView.h
new file mode 100644
index 0000000..5302b86
--- /dev/null
+++ b/libs/installer_bsplugins/src/BSPluginList/PluginListView.h
@@ -0,0 +1,76 @@
+#ifndef BSPLUGINLIST_PLUGINLISTVIEW_H
+#define BSPLUGINLIST_PLUGINLISTVIEW_H
+
+#include <QSet>
+#include <QTreeView>
+
+namespace BSPluginList
+{
+
+struct MarkerInfos
+{
+  QSet<uint> overriding;
+  QSet<uint> overridden;
+  QSet<uint> overwritingAux;
+  QSet<uint> overwrittenAux;
+  QSet<uint> highlight;
+};
+
+class PluginListModel;
+class PluginSortFilterProxyModel;
+
+class PluginListView final : public QTreeView
+{
+  Q_OBJECT
+
+public:
+  explicit PluginListView(QWidget* parent = nullptr);
+
+  void setup();
+
+  void setModel(QAbstractItemModel* model) override;
+  QRect visualRect(const QModelIndex& index) const override;
+
+  [[nodiscard]] QColor markerColor(const QModelIndex& index) const;
+  [[nodiscard]] uint fileFlags(const QModelIndex& index) const;
+  [[nodiscard]] uint conflictFlags(const QModelIndex& index) const;
+
+public slots:
+  void setHighlightedOrigins(const QStringList& origins);
+  void clearOverwriteMarkers();
+  void updateOverwriteMarkers();
+
+signals:
+  void openOriginExplorer(const QModelIndex& index);
+
+protected:
+  bool event(QEvent* event) override;
+  void dragMoveEvent(QDragMoveEvent* event) override;
+  void paintEvent(QPaintEvent* event) override;
+
+  bool moveSelection(int key);
+  bool toggleSelectionState();
+
+private:
+  friend class PluginListContextMenu;
+
+  QModelIndex indexViewToModel(const QModelIndex& index,
+                               const QAbstractItemModel* model) const;
+
+  QModelIndexList indexViewToModel(const QModelIndexList& indices,
+                                   const QAbstractItemModel* model,
+                                   bool includeChildren = true) const;
+
+private slots:
+  void onGroupRenameRequested(const QModelIndex& index, const QString& name);
+
+private:
+  bool m_FirstPaint = true;
+  MarkerInfos m_Markers;
+  PluginListModel* m_PluginModel;
+  PluginSortFilterProxyModel* m_SortProxy;
+};
+
+}  // namespace BSPluginList
+
+#endif  // BSPLUGINLIST_PLUGINLISTVIEW_H