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, 228 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESData/FileConflictParser.cpp b/libs/installer_bsplugins/src/TESData/FileConflictParser.cpp
new file mode 100644
index 0000000..e4958e4
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESData/FileConflictParser.cpp
@@ -0,0 +1,228 @@
+#include "FileConflictParser.h"
+#include "PluginList.h"
+
+#include <log.h>
+
+#include <stdexcept>
+#include <string_view>
+
+namespace TESData
+{
+
+FileConflictParser::FileConflictParser(PluginList* pluginList, FileInfo* plugin,
+                                       bool lightSupported, bool mediumSupported,
+                                       bool blueprintSupported)
+    : m_PluginList{pluginList}, m_Plugin{plugin}, m_LightSupported{lightSupported},
+      m_MediumSupported{mediumSupported}, m_BlueprintSupported{blueprintSupported}
+{
+  m_PluginName = m_Plugin->name().toStdString();
+}
+
+bool FileConflictParser::Group(TESFile::GroupData group)
+{
+  if (group.hasDirectParent()) {
+    m_CurrentPath.push(group, m_Masters, m_PluginName);
+    m_PluginList->addGroupPlaceholder(m_PluginName, m_CurrentPath);
+    m_CurrentPath.pop();
+    return false;
+  }
+
+  if (m_Masters.empty() && group.hasFormType() && group.formType() != "GMST"_ts &&
+      group.formType() != "DOBJ"_ts) {
+    return false;
+  }
+
+  if (group.hasFormType() && group.formType() == "NAVI"_ts) {
+    return false;
+  }
+
+  m_CurrentPath.push(group, m_Masters, m_PluginName);
+  return true;
+}
+
+void FileConflictParser::EndGroup()
+{
+  m_CurrentPath.pop();
+}
+
+bool FileConflictParser::Form(TESFile::FormData form)
+{
+  m_CurrentType = form.type();
+
+  if (m_CurrentPath.groups().empty()) {
+    if (form.type() == "TES4"_ts) {
+      m_Plugin->setMasterFlagged(form.flags() & TESFile::RecordFlags::Master);
+      m_Plugin->setMediumFlagged(m_MediumSupported &&
+                                 (form.flags() & TESFile::RecordFlags::Medium));
+      m_Plugin->setBlueprintFlagged(m_BlueprintSupported &&
+                                    (form.flags() & TESFile::RecordFlags::Blueprint));
+      m_Plugin->setLightFlagged(
+          m_MediumSupported  ? (form.flags() & TESFile::RecordFlags::SmallNew)
+          : m_LightSupported ? (form.flags() & TESFile::RecordFlags::SmallOld)
+                             : false);
+      m_Plugin->setFormVersion(form.formVersion());
+      return true;
+    } else {
+      throw std::runtime_error("Unsupported header record");
+    }
+  }
+
+  switch (m_CurrentPath.groups().front().formType()) {
+  case "DOBJ"_ts:
+  case "GMST"_ts:
+    return true;
+  default:
+    m_CurrentPath.setFormId(form.formId(), m_Masters, m_PluginName);
+
+    const int localModIndex   = form.localModIndex();
+    const bool isMasterRecord = localModIndex < m_Masters.size();
+    return isMasterRecord;
+  }
+}
+
+void FileConflictParser::EndForm()
+{
+  if (m_CurrentType != "TES4"_ts && m_CurrentType != "TES3"_ts &&
+      m_CurrentType != "GMST"_ts && m_CurrentType != "DOBJ"_ts) {
+
+    m_PluginList->addRecordConflict(m_PluginName, m_CurrentPath, m_CurrentType,
+                                    m_CurrentName);
+  }
+
+  m_CurrentPath.unsetFormId();
+  m_CurrentType  = {};
+  m_CurrentChunk = {};
+  m_CurrentName.clear();
+}
+
+bool FileConflictParser::Chunk(TESFile::Type type)
+{
+  m_CurrentChunk = type;
+  if (m_CurrentPath.groups().empty()) {
+    switch (type) {
+    case "HEDR"_ts:
+    case "MAST"_ts:
+    case "CNAM"_ts:
+    case "SNAM"_ts:
+      return true;
+    }
+    return false;
+  } else if (m_CurrentPath.groups().front().formType() == "DOBJ"_ts) {
+    switch (type) {
+    case "DNAM"_ts:
+      return true;
+    }
+    return false;
+  } else {
+    switch (type) {
+    case "EDID"_ts:
+      return true;
+    }
+    return false;
+  }
+}
+
+void FileConflictParser::Data(std::istream& stream)
+{
+  if (m_CurrentPath.groups().empty()) {
+    return MainRecordData(stream);
+  }
+
+  switch (m_CurrentPath.groups().front().formType()) {
+  case "DOBJ"_ts:
+    return DefaultObjectData(stream);
+  case "GMST"_ts:
+    return GameSettingData(stream);
+  default:
+    return StandardData(stream);
+  }
+}
+
+void FileConflictParser::MainRecordData(std::istream& stream)
+{
+  switch (m_CurrentChunk) {
+  case "HEDR"_ts: {
+    struct Header
+    {
+      float version;
+      int32_t numRecords;
+      uint32_t nextObjectId;
+    };
+
+    const auto header = TESFile::readType<Header>(stream);
+    if (stream.fail()) {
+      MOBase::log::error("failed to read HEDR data");
+      return;
+    }
+
+    m_Plugin->setHasNoRecords(header.numRecords == 0);
+    m_Plugin->setHeaderVersion(header.version);
+  } break;
+
+  case "MAST"_ts: {
+    const std::string master = TESFile::readZstring(stream);
+    if (!master.empty()) {
+      m_Plugin->addMaster(QString::fromStdString(master.c_str()));
+      m_Masters.push_back(master);
+    }
+  } break;
+
+  case "CNAM"_ts: {
+    const std::string author = TESFile::readZstring(stream);
+    if (!author.empty()) {
+      m_Plugin->setAuthor(QString::fromLatin1(author.data()));
+    }
+  } break;
+
+  case "SNAM"_ts: {
+    const std::string desc = TESFile::readZstring(stream);
+    if (!desc.empty()) {
+      m_Plugin->setDescription(QString::fromLatin1(desc.data()));
+    }
+  } break;
+  }
+}
+
+void FileConflictParser::DefaultObjectData(std::istream& stream)
+{
+  switch (m_CurrentChunk) {
+  case "DNAM"_ts:
+    while (stream.peek() != std::char_traits<char>::eof()) {
+      const TESFile::Type name = TESFile::readType<TESFile::Type>(stream);
+      [[maybe_unused]] const std::uint32_t formId =
+          TESFile::readType<std::uint32_t>(stream);
+      if (name == TESFile::Type()) {
+        continue;
+      }
+      if (name == "BBBB"_ts) {
+        break;
+      }
+      m_CurrentPath.setTypeId(name);
+      m_PluginList->addRecordConflict(m_PluginName, m_CurrentPath, "DOBJ"_ts, "");
+    }
+    break;
+  }
+}
+
+void FileConflictParser::GameSettingData(std::istream& stream)
+{
+  switch (m_CurrentChunk) {
+  case "EDID"_ts: {
+    const std::string editorId = TESFile::readZstring(stream);
+    m_CurrentPath.setEditorId(editorId);
+    m_PluginList->addRecordConflict(m_PluginName, m_CurrentPath, "GMST"_ts, "");
+  } break;
+  }
+}
+
+void FileConflictParser::StandardData(std::istream& stream)
+{
+  switch (m_CurrentChunk) {
+  case "EDID"_ts: {
+    std::string editorId = TESFile::readZstring(stream);
+    m_CurrentName        = std::move(editorId);
+  } break;
+  }
+}
+
+}  // namespace TESData