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, 158 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESData/RecordPath.cpp b/libs/installer_bsplugins/src/TESData/RecordPath.cpp
new file mode 100644
index 0000000..ac6a575
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESData/RecordPath.cpp
@@ -0,0 +1,158 @@
+#include "RecordPath.h"
+
+#include <algorithm>
+#include <iomanip>
+#include <iterator>
+#include <sstream>
+
+namespace TESData
+{
+
+std::string RecordPath::string() const
+{
+  std::ostringstream ss;
+  ss << ":/";
+
+  for (int i = 0; i < m_Groups.size(); ++i) {
+    const TESFile::GroupData group = m_Groups[i];
+
+    if (group.hasFormType()) {
+      ss << group.formType().view() << "/";
+    } else if (group.hasParent()) {
+      if (i == 0 || !m_Groups[i - 1].hasParent() ||
+          m_Groups[i - 1].parent() != group.parent()) {
+        const auto parentId           = group.parent();
+        const std::uint8_t localIndex = parentId >> 24U;
+        const std::string& owner      = m_Files.at(localIndex);
+        ss << owner << "|";
+        ss << std::hex << std::setfill('0') << std::setw(6) << (parentId & 0xFFFFFF);
+        ss << "/";
+      } else {
+        switch (group.type()) {
+        case TESFile::GroupType::CellPersistentChildren:
+          ss << "Persistent/";
+          break;
+        case TESFile::GroupType::CellTemporaryChildren:
+          ss << "Temporary/";
+          break;
+        case TESFile::GroupType::CellVisibleDistantChildren:
+          ss << "Visible Distant/";
+          break;
+        }
+      }
+    } else if (group.hasBlock()) {
+      ss << group.block() << "/";
+    } else if (group.hasGridCell()) {
+      auto [x, y] = group.gridCell();
+      ss << x << ", " << y << "/";
+    }
+  }
+
+  if (hasFormId()) {
+    const auto id                 = formId();
+    const std::uint8_t localIndex = id >> 24U;
+    const std::string& owner      = m_Files.at(localIndex);
+    ss << owner << "|";
+    ss << std::hex << std::setfill('0') << std::setw(6) << (id & 0xFFFFFF);
+  } else if (hasEditorId()) {
+    ss << editorId();
+  } else if (hasTypeId()) {
+    ss << typeId();
+  }
+
+  return ss.str();
+}
+
+void RecordPath::setFormId(std::uint32_t formId, std::span<const std::string> masters,
+                           const std::string& file)
+{
+  const std::uint8_t localIndex = formId >> 24U;
+  const std::string& owner = localIndex < masters.size() ? masters[localIndex] : file;
+  const std::uint8_t newIndex = static_cast<std::uint8_t>(
+      std::distance(std::begin(m_Files), TESFile::find(m_Files, owner)));
+
+  if (newIndex == m_Files.size()) {
+    m_Files.push_back(owner);
+  }
+
+  m_Identifier = (formId & 0xFFFFFF) | (newIndex << 24U);
+}
+
+void RecordPath::unsetFormId()
+{
+  if (!hasFormId())
+    return;
+
+  const std::uint8_t localIndex = formId() >> 24U;
+  m_Identifier                  = {};
+
+  if (localIndex == m_Files.size() - 1) {
+    cleanLastFile();
+  }
+}
+
+void RecordPath::setEditorId(const std::string& editorId)
+{
+  unsetFormId();
+  m_Identifier = editorId;
+}
+
+void RecordPath::setTypeId(TESFile::Type type)
+{
+  unsetFormId();
+  m_Identifier = type;
+}
+
+void RecordPath::setIdentifier(const Identifier& identifier,
+                               std::span<const std::string> masters)
+{
+  if (std::holds_alternative<std::uint32_t>(identifier)) {
+    setFormId(std::get<std::uint32_t>(identifier), masters, "");
+  } else {
+    unsetFormId();
+    m_Identifier = identifier;
+  }
+}
+
+void RecordPath::push(TESFile::GroupData group, std::span<const std::string> masters,
+                      const std::string& file)
+{
+  if (group.hasParent()) {
+    const std::uint8_t localIndex = group.parent() >> 24U;
+    const std::string& owner = localIndex < masters.size() ? masters[localIndex] : file;
+    const std::uint8_t newIndex = static_cast<std::uint8_t>(
+        std::distance(std::begin(m_Files), TESFile::find(m_Files, owner)));
+
+    if (newIndex == m_Files.size()) {
+      m_Files.push_back(owner);
+    }
+
+    group.setLocalIndex(newIndex);
+  }
+
+  m_Groups.push_back(group);
+}
+
+void RecordPath::pop()
+{
+  unsetFormId();
+
+  const auto& top               = m_Groups.back();
+  const std::uint8_t localIndex = top.hasParent() ? top.parent() >> 24U : 0xFF;
+  m_Groups.pop_back();
+
+  if (localIndex == m_Files.size() - 1) {
+    cleanLastFile();
+  }
+}
+
+void RecordPath::cleanLastFile()
+{
+  if (!std::ranges::any_of(m_Groups, [&](auto&& group) {
+        return group.hasParent() && group.parent() >> 24U == m_Files.size() - 1;
+      })) {
+    m_Files.pop_back();
+  }
+}
+
+}  // namespace TESData