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, 98 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/GUI/MessageDialog.cpp b/libs/installer_bsplugins/src/GUI/MessageDialog.cpp
new file mode 100644
index 0000000..92197c5
--- /dev/null
+++ b/libs/installer_bsplugins/src/GUI/MessageDialog.cpp
@@ -0,0 +1,98 @@
+#include "MessageDialog.h"
+#include "ui_messagedialog.h"
+
+#include <log.h>
+
+#include <QMainWindow>
+#include <QResizeEvent>
+#include <QTimer>
+
+using namespace MOBase;
+
+namespace GUI
+{
+
+MessageDialog::MessageDialog(const QString& text, QWidget* reference)
+    : QDialog(reference), ui{new Ui::MessageDialog}
+{
+  ui->setupUi(this);
+
+  // very crude way to ensure no single word in the test is wider than the message
+  // window. ellide in the center if necessary
+  QFontMetrics metrics(ui->message->font());
+  QString restrictedText;
+  QStringList lines = text.split("\n");
+  foreach (const QString& line, lines) {
+    QString newLine;
+    QStringList words = line.split(" ");
+    foreach (const QString& word, words) {
+      if (word.length() > 10) {
+        newLine +=
+            "<span style=\"nobreak\">" +
+            metrics.elidedText(word, Qt::ElideMiddle, ui->message->maximumWidth()) +
+            "</span>";
+      } else {
+        newLine += word;
+      }
+      newLine += " ";
+    }
+    restrictedText += newLine + "\n";
+  }
+
+  ui->message->setText(restrictedText);
+  this->setWindowFlags(Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
+  this->setFocusPolicy(Qt::NoFocus);
+  this->setAttribute(Qt::WA_ShowWithoutActivating);
+  QTimer::singleShot(1000 + (text.length() * 40), this, SLOT(hide()));
+  if (reference != nullptr) {
+    QPoint position =
+        reference->mapToGlobal(QPoint(reference->width() / 2, reference->height()));
+    position.rx() -= this->width() / 2;
+    position.ry() -= this->height() + 5;
+    move(position);
+  }
+}
+
+MessageDialog::~MessageDialog()
+{
+  delete ui;
+}
+
+void MessageDialog::resizeEvent(QResizeEvent* event)
+{
+  QWidget* par = parentWidget();
+  if (par != nullptr) {
+    QPoint position = par->mapToGlobal(QPoint(par->width() / 2, par->height()));
+    position.rx() -= event->size().width() / 2;
+    position.ry() -= event->size().height() + 5;
+    move(position);
+  }
+}
+
+void MessageDialog::showMessage(const QString& text, QWidget* reference,
+                                bool bringToFront)
+{
+  log::debug("{}", text);
+
+  if (!reference) {
+    for (QWidget* w : qApp->topLevelWidgets()) {
+      if (dynamic_cast<QMainWindow*>(w)) {
+        reference = w;
+        break;
+      }
+    }
+  }
+
+  if (!reference) {
+    return;
+  }
+
+  MessageDialog* dialog = new MessageDialog(text, reference);
+  dialog->show();
+
+  if (bringToFront) {
+    reference->activateWindow();
+  }
+}
+
+}  // namespace GUI