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, 222 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESData/FileInfo.h b/libs/installer_bsplugins/src/TESData/FileInfo.h
new file mode 100644
index 0000000..57c5d60
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESData/FileInfo.h
@@ -0,0 +1,222 @@
+#ifndef TESDATA_FILEINFO_H
+#define TESDATA_FILEINFO_H
+
+#include <ifiletree.h>
+#include <memoizedlock.h>
+
+#include <boost/container/flat_set.hpp>
+
+#include <QDateTime>
+#include <QSet>
+#include <QString>
+
+namespace TESData
+{
+
+class PluginList;
+
+class FileInfo
+{
+public:
+  enum EConflictFlag : uint
+  {
+    CONFLICT_NONE                = 0x0,
+    CONFLICT_OVERRIDE            = 0x1,
+    CONFLICT_OVERRIDDEN          = 0x2,
+    CONFLICT_ARCHIVE_OVERWRITE   = 0x4,
+    CONFLICT_ARCHIVE_OVERWRITTEN = 0x8,
+
+    CONFLICT_MIXED         = CONFLICT_OVERRIDE | CONFLICT_OVERRIDDEN,
+    CONFLICT_ARCHIVE_MIXED = CONFLICT_ARCHIVE_OVERWRITE | CONFLICT_ARCHIVE_OVERWRITTEN,
+  };
+
+  enum EFlag : uint
+  {
+    FLAG_NONE        = 0x000,
+    FLAG_PROBLEMATIC = 0x001,
+    FLAG_INFORMATION = 0x002,
+    FLAG_INI         = 0x004,
+    FLAG_BSA         = 0x008,
+    FLAG_MASTER      = 0x010,
+    FLAG_MEDIUM      = 0x020,
+    FLAG_LIGHT       = 0x040,
+    FLAG_BLUEPRINT   = 0x080,
+    FLAG_CLEAN       = 0x100,
+  };
+
+  struct FileSystemData
+  {
+    QString name;
+
+    bool hasMasterExtension;
+    bool hasLightExtension;
+
+    bool forceLoaded;
+    bool forceEnabled;
+    bool forceDisabled;
+
+    bool hasIni;
+    boost::container::flat_set<QString, MOBase::FileNameComparator> archives;
+  };
+
+  struct Metadata
+  {
+    QString author;
+    QString description;
+
+    bool isMasterFlagged;
+    bool isMediumFlagged;
+    bool isLightFlagged;
+    bool isBlueprintFlagged;
+    bool hasNoRecords;
+
+    int formVersion;
+    float headerVersion;
+
+    QStringList masters;
+    mutable boost::container::flat_set<QString, MOBase::FileNameComparator> masterUnset;
+  };
+
+  struct State
+  {
+    bool enabled;
+    int priority = -1;
+    QString index;
+    int loadOrder;
+    QString group;
+
+    bool operator<(const State& other) const { return (loadOrder < other.loadOrder); }
+  };
+
+  struct Conflicts
+  {
+    EConflictFlag m_CurrentConflictState = CONFLICT_NONE;
+    QSet<int> m_OverridingList;
+    QSet<int> m_OverriddenList;
+    QSet<int> m_OverwritingArchiveList;
+    QSet<int> m_OverwrittenArchiveList;
+  };
+
+  FileInfo(PluginList* pluginList, const QString& name, bool forceLoaded,
+           bool forceEnabled, bool forceDisabled, bool lightSupported);
+
+  [[nodiscard]] const QString& name() const { return m_FileSystemData.name; }
+
+  [[nodiscard]] bool hasMasterExtension() const
+  {
+    return m_FileSystemData.hasMasterExtension;
+  }
+
+  [[nodiscard]] bool hasLightExtension() const
+  {
+    return m_FileSystemData.hasLightExtension;
+  }
+
+  [[nodiscard]] bool forceLoaded() const { return m_FileSystemData.forceLoaded; }
+  [[nodiscard]] bool forceEnabled() const { return m_FileSystemData.forceEnabled; }
+  [[nodiscard]] bool forceDisabled() const { return m_FileSystemData.forceDisabled; }
+
+  [[nodiscard]] bool hasIni() const { return m_FileSystemData.hasIni; }
+  void setHasIni(bool hasIni) { m_FileSystemData.hasIni = hasIni; }
+  [[nodiscard]] const auto& archives() const { return m_FileSystemData.archives; }
+  void addArchive(const QString& archive) { m_FileSystemData.archives.insert(archive); }
+
+  [[nodiscard]] const QString& author() const { return m_Metadata.author; }
+  void setAuthor(const QString& author) { m_Metadata.author = author; }
+  [[nodiscard]] const QString& description() const { return m_Metadata.description; }
+  void setDescription(const QString& text) { m_Metadata.description = text; }
+  [[nodiscard]] bool isMasterFlagged() const { return m_Metadata.isMasterFlagged; }
+  void setMasterFlagged(bool value) { m_Metadata.isMasterFlagged = value; }
+  [[nodiscard]] bool isMediumFlagged() const { return m_Metadata.isMediumFlagged; }
+  void setMediumFlagged(bool value) { m_Metadata.isMediumFlagged = value; }
+  [[nodiscard]] bool isLightFlagged() const { return m_Metadata.isLightFlagged; }
+  void setLightFlagged(bool value) { m_Metadata.isLightFlagged = value; }
+  [[nodiscard]] bool isBlueprintFlagged() const { return m_Metadata.isBlueprintFlagged; }
+  void setBlueprintFlagged(bool value) { m_Metadata.isBlueprintFlagged = value; }
+  [[nodiscard]] bool hasNoRecords() const { return m_Metadata.hasNoRecords; }
+  void setHasNoRecords(bool value) { m_Metadata.hasNoRecords = value; }
+  [[nodiscard]] int formVersion() const { return m_Metadata.formVersion; }
+  void setFormVersion(int value) { m_Metadata.formVersion = value; }
+  [[nodiscard]] float headerVersion() const { return m_Metadata.headerVersion; }
+  void setHeaderVersion(float value) { m_Metadata.headerVersion = value; }
+
+  [[nodiscard]] const auto& masters() const { return m_Metadata.masters; }
+  void addMaster(const QString& master) { m_Metadata.masters.push_back(master); }
+
+  [[nodiscard]] bool hasMissingMasters() const
+  {
+    return !m_Metadata.masterUnset.empty();
+  }
+
+  [[nodiscard]] const auto& missingMasters() const { return m_Metadata.masterUnset; }
+
+  template <std::ranges::input_range R>
+  void setMissingMasters(R&& range) const
+  {
+    m_Metadata.masterUnset.clear();
+    m_Metadata.masterUnset.insert(std::begin(range), std::end(range));
+  }
+
+  [[nodiscard]] bool enabled() const { return m_State.enabled; }
+  void setEnabled(bool enabled) { m_State.enabled = enabled; }
+  [[nodiscard]] int priority() const { return m_State.priority; }
+  void setPriority(int priority)
+  {
+    m_State.priority = priority;
+    m_Conflicts.invalidate();
+  }
+  [[nodiscard]] const QString& index() const { return m_State.index; }
+  void setIndex(const QString& index) { m_State.index = index; }
+  [[nodiscard]] int loadOrder() const { return m_State.loadOrder; }
+  void setLoadOrder(int loadOrder) { m_State.loadOrder = loadOrder; }
+  [[nodiscard]] const QString& group() const { return m_State.group; }
+  void setGroup(const QString& group) { m_State.group = group; }
+
+  [[nodiscard]] EConflictFlag conflictState() const
+  {
+    return m_Conflicts.value().m_CurrentConflictState;
+  }
+
+  [[nodiscard]] const auto& getPluginOverriding() const
+  {
+    return m_Conflicts.value().m_OverridingList;
+  }
+
+  [[nodiscard]] const auto& getPluginOverridden() const
+  {
+    return m_Conflicts.value().m_OverriddenList;
+  }
+
+  [[nodiscard]] const auto& getPluginOverwritingArchive() const
+  {
+    return m_Conflicts.value().m_OverwritingArchiveList;
+  }
+
+  [[nodiscard]] const auto& getPluginOverwrittenArchive() const
+  {
+    return m_Conflicts.value().m_OverwrittenArchiveList;
+  }
+
+  [[nodiscard]] bool isMasterFile() const;
+  [[nodiscard]] bool isMediumFile() const;
+  [[nodiscard]] bool isSmallFile() const;
+  [[nodiscard]] bool isBlueprintFile() const;
+  [[nodiscard]] bool isAlwaysEnabled() const;
+  [[nodiscard]] bool canBeToggled() const;
+  [[nodiscard]] bool mustLoadAfter(const FileInfo& other) const;
+
+  void invalidateConflicts() const { m_Conflicts.invalidate(); }
+
+private:
+  [[nodiscard]] Conflicts doConflictCheck() const;
+
+  PluginList* m_PluginList;
+  FileSystemData m_FileSystemData;
+  Metadata m_Metadata;
+  State m_State;
+  mutable MOBase::MemoizedLocked<Conflicts> m_Conflicts;
+};
+
+}  // namespace TESData
+
+#endif  // TESDATA_FILEINFO_H