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, 179 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESData/SingleRecordParser.cpp b/libs/installer_bsplugins/src/TESData/SingleRecordParser.cpp
new file mode 100644
index 0000000..5cc553d
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESData/SingleRecordParser.cpp
@@ -0,0 +1,179 @@
+#include "SingleRecordParser.h"
+#include "FormParser.h"
+
+#include <algorithm>
+#include <array>
+#include <iterator>
+#include <utility>
+
+using namespace Qt::Literals::StringLiterals;
+
+namespace TESData
+{
+
+using Game = FormParserManager::Game;
+
+static constexpr auto GameMap = std::to_array<std::pair<QStringView, Game>>({
+    {u"Skyrim Special Edition", Game::SSE},
+    {u"Skyrim VR", Game::SSE},
+    {u"Enderal Special Edition", Game::SSE},
+    {u"Fallout 4", Game::FO4},
+    {u"Fallout 4 VR", Game::FO4},
+    {u"Skyrim", Game::TES5},
+    {u"Enderal", Game::TES5},
+    {u"New Vegas", Game::FNV},
+    {u"TTW", Game::FNV},
+    {u"Fallout 3", Game::FO3},
+    {u"Oblivion", Game::TES4},
+    {u"Oblivion Remastered", Game::TES4},
+});
+
+static Game gameIdentifier(QStringView gameName)
+{
+  const auto it = std::ranges::find_if(GameMap, [=](auto&& pair) {
+    return pair.first == gameName;
+  });
+
+  if (it != std::end(GameMap)) {
+    return it->second;
+  } else {
+    return Game::Unknown;
+  }
+}
+
+SingleRecordParser::SingleRecordParser(const QString& gameName, const RecordPath& path,
+                                       const std::string& file, DataItem* root,
+                                       int index)
+    : m_GameName{gameName}, m_Path{path}, m_File{file}, m_DataRoot{root},
+      m_FileIndex{index}
+{}
+
+bool SingleRecordParser::Group(TESFile::GroupData group)
+{
+  if (m_Depth == m_Path.groups().size()) {
+    return false;
+  }
+
+  if (group.hasParent()) {
+    const std::uint8_t localIndex = group.parent() >> 24U;
+    const std::string& owner =
+        localIndex < m_Masters.size() ? m_Masters[localIndex] : m_File;
+    const auto files            = m_Path.files();
+    const std::uint8_t newIndex = static_cast<std::uint8_t>(
+        std::distance(std::begin(files), TESFile::find(files, owner)));
+
+    group.setLocalIndex(newIndex);
+  }
+
+  if (group == m_Path.groups()[m_Depth]) {
+    ++m_Depth;
+    return true;
+  }
+
+  return false;
+}
+
+bool SingleRecordParser::Form(TESFile::FormData form)
+{
+  m_CurrentType  = form.type();
+  m_CurrentFlags = form.flags();
+
+  if (m_Depth == 0) {
+    if (form.type() == "TES4"_ts) {
+      m_Localized = (form.flags() & TESFile::RecordFlags::Localized);
+    }
+
+    return true;
+  }
+
+  if (m_Path.hasFormId()) {
+    if ((form.formId() & 0xFFFFFF) != (m_Path.formId() & 0xFFFFFF)) {
+      return false;
+    }
+
+    const std::uint8_t localIndex = form.formId() >> 24U;
+    const std::string& owner =
+        localIndex < m_Masters.size() ? m_Masters[localIndex] : m_File;
+    if (!TESFile::iequals(m_Path.files()[m_Path.formId() >> 24U], owner)) {
+      return false;
+    }
+
+    m_RecordFound   = true;
+    const auto game = gameIdentifier(m_GameName);
+    FormParserManager::getParser(game, m_CurrentType)
+        ->parseFlags(m_DataRoot, m_FileIndex, m_CurrentFlags);
+    return true;
+  } else {
+    return !m_RecordFound;
+  }
+
+  return false;
+}
+
+bool SingleRecordParser::Chunk(TESFile::Type type)
+{
+  m_CurrentChunk = type;
+  return true;
+}
+
+void SingleRecordParser::Data(std::istream& stream)
+{
+  m_ChunkStream = &stream;
+
+  if (m_Depth == 0) {
+    if (m_CurrentChunk == "MAST"_ts) {
+      const std::string master = TESFile::readZstring(stream);
+      if (!master.empty()) {
+        m_Masters.push_back(master);
+      }
+    }
+    return;
+  }
+
+  if (m_Path.hasEditorId() && m_CurrentChunk == "EDID"_ts) {
+    const std::string editorId = TESFile::readZstring(stream);
+    if (editorId != m_Path.editorId()) {
+      return;
+    }
+
+    m_RecordFound   = true;
+    const auto game = gameIdentifier(m_GameName);
+    FormParserManager::getParser(game, m_CurrentType)
+        ->parseFlags(m_DataRoot, m_FileIndex, m_CurrentFlags);
+    stream.seekg(std::ios::beg);
+  }
+
+  if (m_Path.hasTypeId() && m_CurrentChunk == "DNAM"_ts) {
+    while (stream.peek() != std::char_traits<char>::eof()) {
+      const TESFile::Type name   = TESFile::readType<TESFile::Type>(stream);
+      const QString formIdString = readFormId(m_Masters, m_File, stream);
+      if (name == m_Path.typeId()) {
+        m_DataRoot->getOrInsertChild(0, name, u""_s)
+            ->setData(m_FileIndex, formIdString);
+        m_RecordFound = true;
+        break;
+      }
+      if (name == "BBBB"_ts) {
+        break;
+      }
+    }
+    return;
+  }
+
+  if (!m_RecordFound) {
+    return;
+  }
+
+  if (!m_ParseTask) {
+    const auto game = gameIdentifier(m_GameName);
+    m_ParseTask     = FormParserManager::getParser(game, m_CurrentType)
+                      ->parseForm(m_DataRoot, m_FileIndex, m_Localized, m_Masters,
+                                  m_File, m_CurrentChunk, m_ChunkStream);
+  }
+
+  if (!m_ParseTask.done()) {
+    m_ParseTask.resume();
+  }
+}
+
+}  // namespace TESData