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, 137 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/BSPluginList/PluginListModel.h b/libs/installer_bsplugins/src/BSPluginList/PluginListModel.h
new file mode 100644
index 0000000..d0de9c6
--- /dev/null
+++ b/libs/installer_bsplugins/src/BSPluginList/PluginListModel.h
@@ -0,0 +1,137 @@
+#ifndef BSPLUGINLIST_PLUGINLISTMODEL_H
+#define BSPLUGINLIST_PLUGINLISTMODEL_H
+
+#include "TESData/PluginList.h"
+
+#include <QAbstractItemModel>
+
+#include <functional>
+
+namespace BSPluginList
+{
+
+class PluginListModel final : public QAbstractItemModel
+{
+  Q_OBJECT
+
+public:
+  friend class PluginGroupProxyModel;
+
+  enum ItemDataRole
+  {
+    GroupingRole = Qt::UserRole,
+    IndexRole,
+    InfoRole,
+    ConflictsIconRole,
+    FlagsIconRole,
+    OriginRole,
+    OverridingRole,
+    OverriddenRole,
+    OverwritingAuxRole,
+    OverwrittenAuxRole,
+    ScrollMarkRole,
+  };
+
+  enum EColumn
+  {
+    COL_NAME,
+    COL_CONFLICTS,
+    COL_FLAGS,
+    COL_PRIORITY,
+    COL_MODINDEX,
+    COL_FORMVERSION,
+    COL_HEADERVERSION,
+    COL_AUTHOR,
+    COL_DESCRIPTION,
+
+    COL_COUNT
+  };
+
+  explicit PluginListModel(TESData::PluginList* plugins);
+
+  QModelIndex index(int row, int column,
+                    const QModelIndex& parent = QModelIndex()) const override;
+  QModelIndex parent(const QModelIndex& index) const override;
+
+  Qt::ItemFlags flags(const QModelIndex& index) const override;
+  QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+  QVariant headerData(int section, Qt::Orientation orientation,
+                      int role) const override;
+  int rowCount(const QModelIndex& parent = QModelIndex()) const override;
+  int columnCount(const QModelIndex& parent = QModelIndex()) const override;
+
+  bool setData(const QModelIndex& index, const QVariant& value,
+               int role = Qt::EditRole) override;
+
+  Qt::DropActions supportedDropActions() const override;
+  bool canDropMimeData(const QMimeData* data, Qt::DropAction action, int row,
+                       int column, const QModelIndex& parent) const override;
+  bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column,
+                    const QModelIndex& parent) override;
+
+  [[nodiscard]] QStringList
+  groups(std::function<bool(const TESData::FileInfo*)> pred = {}) const;
+  [[nodiscard]] QStringList masterGroups() const;
+  [[nodiscard]] QStringList regularGroups() const;
+
+public slots:
+  void refresh();
+
+  void invalidate();
+  void invalidateConflicts();
+
+  void movePlugin(const QString& name, int oldPriority, int newPriority);
+
+  void
+  changePluginStates(const std::map<QString, MOBase::IPluginList::PluginStates>& infos);
+
+  // enable/disable all plugins
+  //
+  void setEnabledAll(bool enabled);
+
+  // enable/disable plugins at the given indices.
+  //
+  void setEnabled(const QModelIndexList& indices, bool enabled);
+
+  // send plugins to the given priority
+  //
+  void sendToPriority(const QModelIndexList& indices, int priority,
+                      bool disjoint = false);
+
+  // shift the priority of mods at the given indices by the given offset
+  //
+  void shiftPluginsPriority(const QModelIndexList& indices, int offset);
+
+  // toggle the active state of mods at the given indices
+  //
+  void toggleState(const QModelIndexList& indices);
+
+  // assign plugins to a group
+  //
+  void setGroup(const QModelIndexList& indices, const QString& group);
+
+  // send plugins to the bottom of a group
+  //
+  void sendToGroup(const QModelIndexList& indices, const QString& group, bool isESM);
+
+signals:
+  void pluginStatesChanged(const QModelIndexList& indices) const;
+  void pluginOrderChanged() const;
+
+private:
+  [[nodiscard]] QVariant displayData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant checkstateData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant foregroundData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant backgroundData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant fontData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant alignmentData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant tooltipData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant conflictData(const QModelIndex& index) const;
+  [[nodiscard]] QVariant iconData(const QModelIndex& index) const;
+
+  TESData::PluginList* m_Plugins;
+};
+
+}  // namespace BSPluginList
+
+#endif  // BSPLUGINLIST_PLUGINLISTMODEL_H