subagent transcript

session 17f09f89 · workflow wf_a3d8d75a
← 17f09f89 · archive
delegated task
CONTEXT: FreeCAD 26.3 compiled to WebAssembly (emscripten, single-thread, ASYNCIFY, static Qt 6.11.1 + OCCT + Coin3D + CPython 3.14, NO dlopen/subproc
▸ Magik
CONTEXT: FreeCAD 26.3 compiled to WebAssembly (emscripten, single-thread, ASYNCIFY, static Qt 6.11.1 + OCCT + Coin3D + CPython 3.14, NO dlopen/subprocess/threads). After a big push it now has 17 workbenches, numpy, Draft/TechDraw/Assembly all working. The 3D VIEWPORT RENDERS WELL (Coin3D -> WebGL via an offscreen FBO + QPainter blit). Toolbars/menus/tree are functional. THREE PROBLEM AREAS TO RESEARCH (be concrete, grep the real source + deploy, cite files): A) UNSTYLED UI (from a screenshot): the right "Tasks" panel (Gui::TaskView, shows "Start Part"/"New Body") has NO background — floating text on the 3D view. Context menus (right-click tree) are plain white, no hover highlight. NO hover states anywhere (buttons/menu items don't react on mouse-over). Font looks slightly oversized. This is the classic signature of FreeCAD's Qt STYLESHEET (.qss) + assets not being applied. FreeCAD ships stylesheets in src/Gui/Stylesheets/*.qss ("FreeCAD Dark.qss", "FreeCAD Light.qss", "Behave-*.qss") and the overlay/taskview qss; the active one is set by the preference MainWindow/StyleSheet and applied via qApp->setStyleSheet / Gui::Application. Icons/qss may be in a Qc qrc compiled into the wasm OR need FS packaging. B) The RENDER PERF hot path (from a profiler trace of a single mouse-wheel zoom = 96ms): dominated by Coin's IMMEDIATE-MODE GL emulation — emscripten's ffVertex/ffEnd/ffNormal3/ffColor4 (per-vertex glBegin/glVertex emulation) called from Coin scenegraph traversal (recursive wasm-function[15570]/[48370]), plus _glTexSubImage2D (~4ms, the FBO->texture blit) and _glReadPixels. deploy/index.html sets `COIN_VERTEX_ARRAYS=0` and `COIN_AUTO_CACHING=0` in Module.preRun ENV — these DISABLE Coin vertex arrays (forcing the slow immediate-mode path) and render caching. There are NO wasm debug symbols so wasm-function[N] can't be resolved. C) NEXT PARITY STAGES: (1) browser-reload PERSISTENCE is broken — IDBFS mount+hydrate work, but FreeCAD's user.cfg ParameterManager serializer is created in Application::bootstrapEarly()->LoadParameters() with a stale root path ("/user.cfg") before the real UserConfigPath is known; App.saveParameter() then writes to /user.cfg (or no-ops). An attempted fix re-pointed the serializer in LoadParameters()'s idempotent-guard using getUserConfigPath() but it did NOT work (user.cfg still not at /tmp/.config/FreeCAD/v26-3/). (2) CAM is blocked because pybind11 is absent from /opt/toolchains (CAM's area/tsp_solver need it). (3) BIM/Arch could partially load now that Draft+numpy exist (IFC needs ifcopenshell, but non-IFC Arch modeling may work). PATHS: FreeCAD source /home/magik6k/lcad-wasm/freecad-port/FreeCAD (git branch wasm-parity-push). wasm build tree /opt/toolchains/src/freecad-gui-build. deploy /home/magik6k/lcad-wasm/freecad-port/deploy (index.html + *.data + *.data.js — grep the .data.js manifests to see what's on the FS). Toolchain env: source /home/magik6k/lcad-wasm/env.sh. To check what's packaged: the .data.js files contain a JSON "files" manifest with "filename" paths. The base freecad.data mounts at /freecad (share at /freecad/share, modules at /freecad/Mod). getResourceDir()=/freecad/share/. Qt wasm plugin + qt.conf considerations apply. DIMENSION A — UNSTYLED UI root cause + fix. Investigate: 1. How FreeCAD applies its stylesheet on startup: grep src/Gui for setStyleSheet / MainWindow/StyleSheet / "Stylesheets" / OverlayStyleSheet / Gui::Application::setStyleSheet / MainWindow::setStyleSheet. What preference key selects the active .qss and what is its DEFAULT (empty = no stylesheet = the broken look?). 2. Are the .qss files (src/Gui/Stylesheets/*.qss) + their referenced icons/images on the wasm FS? Check: are they compiled into a Qt qrc resource (:/stylesheets or a Resources.qrc / .qrc in src/Gui) that's IN the wasm, or installed to share/Gui/Stylesheets and thus need FS packaging? grep the deploy .data.js manifests for "Stylesheets" / ".qss" / "Gui/Stylesheets". Determine the runtime lookup path. 3. The TASK PANEL no-background: how does Gui::TaskView/TaskView.cpp / DockWindowManager / OverlayManager get its background — is it purely from the .qss (so no qss => transparent)? Confirm. 4. Whether simply setting a default stylesheet (e.g. "FreeCAD Light.qss") via the MainWindow/StyleSheet preference at startup + packaging the qss assets FIXES the task panel bg + context menu + hover. Produce the exact fix: files to package (src->mount), the preference to set (and how — a default in code under __EMSCRIPTEN__, or seed user.cfg, or a boot.py Gui call), and how to verify (screenshot via the probe below). VERIFY MECHANISM: you can set deploy/boot.py to run Gui code (e.g. import FreeCADGui as Gui; set the stylesheet param) and screenshot with a playwright probe — but DO NOT run long builds; if a fix needs a rebuild, describe it. Grep-based evidence is enough for the plan.
Fable
thinking
I'm going to dig into the FreeCAD codebase and deployment configs to track down what's causing the unstyled UI issue in Dimension A.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -rn \"MainWindow/StyleSheet\\|setStyleSheet\" src/Gui/Application.cpp src/Gui/MainWindow.cpp 2>/dev/null | head -50", "description": "grep stylesheet application logic"}
tool result
src/Gui/Application.cpp:482:            setStyleSheet(QString::fromStdString(sheet), tiledBG);
src/Gui/Application.cpp:2879:void Application::setStyleSheet(const QString& qssFile, bool tiledBackground)
src/Gui/Application.cpp:2950:            qApp->setStyleSheet(defaultStyleSheet + QStringLiteral("\n") + styleSheetContent);
src/Gui/Application.cpp:2978:            qApp->setStyleSheet(defaultStyleSheet);
src/Gui/Application.cpp:2984:            qApp->setStyleSheet(defaultStyleSheet);
src/Gui/Appl  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && ls src/Gui/Stylesheets/ 2>/dev/null; echo \"---QRC---\"; ls src/Gui/*.qrc 2>/dev/null; echo \"---grep qrc for stylesheet---\"; grep -rln \"Stylesheets\\|\\.qss\" src/Gui/*.qrc …
tool result
CMakeLists.txt
defaults.qss
FreeCAD.qss
images_classic
images_dark-light
overlay
parameters
---QRC---
(eval):1: no matches found: src/Gui/*.qrc
---grep qrc for stylesheet---
(eval):1: no matches found: src/Gui/*.qrc
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy && ls -la; echo \"---manifests---\"; ls *.data.js 2>/dev/null", "description": "list deploy dir"}
tool result
total 419988
drwxr-xr-x 1 magik6k magik6k      1070 Jul  5 22:26 .
drwxr-xr-x 1 magik6k magik6k       742 Jul  5 23:19 ..
-rw-r--r-- 1 magik6k magik6k       941 Jul  5 22:27 boot.py
-rw-r--r-- 1 magik6k magik6k  15229294 Jul  4 20:36 freecad.data
-rw------- 1 magik6k magik6k   8977277 Jul  4 20:36 freecad.data.gz
-rw-r--r-- 1 magik6k magik6k    135559 Jul  4 20:36 freecad.data.js
-rw------- 1 magik6k magik6k     17642 Jul  4 20:36 freecad.data.js.gz
-rw-r--r-- 1 magik  …[truncated]
Fable
thinking
The stylesheet directory structure has shifted in FreeCAD 26.x to a theme-based system with defaults, specific theme files, and image directories for different themes. I need to check how Application.cpp handles the stylesheet loading and which preference key controls this.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && sed -n '460,500p' src/Gui/Application.cpp", "description": "read Application.cpp startup styling"}
tool result
            return path;
        }

        return fmt::format("qss:parameters/{}.yaml", hMainWindowGrp->GetASCII("Theme", "Classic"));
    };

    auto themeParametersSource = new StyleParameters::YamlParameterSource(
        deduceParametersFilePath(),
        {.name = QT_TR_NOOP("Theme Parameters"),
         .options = StyleParameters::ParameterSourceOption::UserEditable}
    );

    auto reloadStylesheetHandler = handlers.addDelayedHandler(
        "BaseApp/Preferences/MainWindow",
        {  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && sed -n '2879,3015p' src/Gui/Application.cpp", "description": "read setStyleSheet impl"}
tool result
void Application::setStyleSheet(const QString& qssFile, bool tiledBackground)
{
    Gui::MainWindow* mw = getMainWindow();
    auto mdi = mw->findChild<QMdiArea*>();
    mdi->setProperty("showImage", tiledBackground);

    // Qt's style sheet doesn't support it to define the link color of a QLabel
    // or in the property editor when an expression is set because therefore the
    // link color of the application's palette is used.
    // A workaround is to set a user-defined property to e.g. a   …[truncated]
Fable
thinking
In FreeCAD 26.x, there's a base stylesheet called `defaults.qss` that always gets applied regardless of user preferences—even when the StyleSheet preference is empty, the application still loads and sets this default stylesheet. This provides the foundational styling for elements like the task panel background, hover states, and menus, so there's always a baseline visual appearance in place.

The StyleSheet preference is stored under `BaseApp/Preferences/MainWindow` with the key `StyleSheet`, and there's also a `Theme` preference that defaults to "Classic". The critical issue is whether the `qss:` search path prefix—which is set up during application initialization—can properly resolve `qss:  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -rn \"addSearchPath\\|setSearchPaths\\|\\\"qss\\\"\\|\\\"images\\\"\\|Stylesheets\" src/Gui/Application.cpp | head -40", "description": "find qss search path setup"}
tool result
src/Gui/Application.cpp:2933:        // For qss they are set-up in runApplication() with the prefix "qss"
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -rn \"Stylesheets\\|defaults.qss\\|images_dark\\|images_classic\" src/Gui/CMakeLists.txt | head; echo \"===install===\"; grep -rn \"Stylesheets\" src/Gui/CMakeLists.txt", …
tool result
src/Gui/CMakeLists.txt:14:add_subdirectory(Stylesheets)
===install===
src/Gui/CMakeLists.txt:14:add_subdirectory(Stylesheets)
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -rn \"addSearchPath\\|setSearchPaths\\|\\\"qss\\\"\\|\\\"images\\\"\\|StyleSheet\\|Stylesheets\" src/Gui/GuiApplication.cpp src/Main/*.cpp 2>/dev/null | head -40; echo \"=…
tool result
===search all Gui for qss searchpath===
src/Gui/BitmapFactory.cpp
src/Gui/PreferencePackManager.cpp
src/Gui/StartupProcess.cpp
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && cat src/Gui/Stylesheets/CMakeLists.txt", "description": "read stylesheets cmake install"}
tool result
SET(Stylesheets_Files
    "FreeCAD.qss"
    "defaults.qss"
)

SET(Parameters_Files
    "parameters/FreeCAD Dark.yaml"
    "parameters/FreeCAD Light.yaml"
)

SET(Overlay_Stylesheets_Files
    "overlay/Freecad Overlay.qss"
)

# Find all the image files
FILE(GLOB Images_Files RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/images_dark-light/*.svg")

SOURCE_GROUP("Images_dark-light" FILES ${Images_Files})

FILE(GLOB Images_Files2 RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}"
    "${  …[truncated]
Fable
thinking
The stylesheets are stored as actual files in `share/Gui/Stylesheets` rather than being compiled into a resource file, so they need to be packaged with the filesystem. Since `getResourceDir()` points to `/freecad/share/`, the stylesheets should end up at `/freecad/share/Gui/Stylesheets/`. Now I need to track down where the search paths for "qss" and "images" are configured.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -n \"addSearchPath\\|Stylesheets\\|\\\"qss\\\"\\|\\\"images\\\"\\|StyleSheet\\|getResourceDir\\|Gui/Stylesheets\" src/Gui/StartupProcess.cpp", "description": "stylesheet s…
tool result
127:    setStyleSheetPaths();
142:void StartupProcess::setStyleSheetPaths()
146:    qssPaths << QString::fromUtf8((App::Application::getUserAppDataDir() + "Gui/Stylesheets/").c_str())
147:             << QString::fromUtf8((App::Application::getResourceDir() + "Gui/Stylesheets/").c_str())
149:    QDir::setSearchPaths(QStringLiteral("qss"), qssPaths);
153:        (App::Application::getUserAppDataDir() + "Gui/Stylesheets/overlay").c_str()
154:    ) << QString::fromUtf8((App::Application::getResourc  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && sed -n '142,170p;530,560p' src/Gui/StartupProcess.cpp", "description": "read search path + setStyleSheet default"}
tool result
void StartupProcess::setStyleSheetPaths()
{
    // setup the search paths for Qt style sheets
    QStringList qssPaths;
    qssPaths << QString::fromUtf8((App::Application::getUserAppDataDir() + "Gui/Stylesheets/").c_str())
             << QString::fromUtf8((App::Application::getResourceDir() + "Gui/Stylesheets/").c_str())
             << QLatin1String(":/stylesheets");
    QDir::setSearchPaths(QStringLiteral("qss"), qssPaths);
    // setup the search paths for Qt overlay style sheets
    QStrin  …[truncated]
Fable
thinking
Looking at the QSS stylesheet search paths that FreeCAD uses: the user app data directory, the resource directory at `/freecad/share/Gui/Stylesheets/`, and the qrc resource path, though I need to verify if that qrc resource actually exists. The StyleSheet preference seems to be cut off mid-thought, but it's likely determining which of these paths takes precedence.

The critical issue is whether the `/freecad/share/Gui/Stylesheets/` directory is actually packaged in the deployment data, and whether the `:/stylesheets` qrc resource exists at all. I should check the deployment manifests for references to "Stylesheets" to answer this.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy && grep -o '\"filename\"[^,]*Stylesheets[^,]*' *.data.js 2>/dev/null | head -40; echo \"=== count ===\"; grep -o 'Stylesheets' *.data.js | wc -l; echo \"=== any .qss ===\"; grep -o…
tool result
freecad.data.js:"filename": "/freecad/share/Gui/Stylesheets/FreeCAD.qss"
freecad.data.js:"filename": "/freecad/share/Gui/Stylesheets/defaults.qss"
freecad.data.js:"filename": "/freecad/share/Gui/Stylesheets/images_classic/arrow-double-leftright-black.png"
freecad.data.js:"filename": "/freecad/share/Gui/Stylesheets/images_classic/arrow-double-leftright-black.svg"
freecad.data.js:"filename": "/freecad/share/Gui/Stylesheets/images_classic/arrow-double-leftright-blue.png"
freecad.data.js:"filename":  …[truncated]
Fable
thinking
The stylesheets are definitely packaged in the right location, but I need to verify whether the `parameters/*.yaml` files are also included and whether `getResourceDir()` actually points to `/freecad/share/`. I should also check if `defaults.qss` has variable references that depend on those yaml parameter files to resolve. The real issue is that FreeCAD 26.x switched to a new theme system using `replaceVariablesInQss` and a StyleParameters manager that reads from yaml files.

The variables in `defaults.qss` like `@{...}` get replaced during processing, but if the yaml parameter source fails to load, the replacement could produce broken or empty CSS. Since `defaults.qss` loads even when the S  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== defaults.qss (lines / size) ===\"; wc -l src/Gui/Stylesheets/defaults.qss; echo; echo \"=== FreeCAD.qss size ===\"; wc -l src/Gui/Stylesheets/FreeCAD.qss; echo \"===…
tool result
=== defaults.qss (lines / size) ===
20 src/Gui/Stylesheets/defaults.qss

=== FreeCAD.qss size ===
2737 src/Gui/Stylesheets/FreeCAD.qss
=== grep TaskView / QMenu / hover in each ===
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
FreeCAD.qss is a comprehensive 2737-line stylesheet covering the full theme with TaskView, QMenu, hover states, and other components, while defaults.qss is just a minimal 20-line file. Let me verify that FreeCAD.qss actually includes all those elements.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && cat src/Gui/Stylesheets/defaults.qss; echo \"=== FreeCAD.qss key selectors ===\"; grep -n \"TaskView\\|QMenu\\|:hover\\|QSint\\|TaskPanel\\|actionLabel\\|header\" src/Gui/Style…
tool result
/*
 * This is a file with default QSS styles that will be preincluded for all themes. It should cover only the styles for
 * our own controls and not alter visuals of stuff like buttons etc. This is created so we can use QSS to add color
 * to links or control certain aspects of program looks that should be shared across all styles, including classic.
 */

/* Gui::SplitButton --------------------------------------------------------- */

Gui--SplitButton QToolButton[splitRole="menu"] {
    width:  …[truncated]
Fable
thinking
The StyleSheet preference is empty in the wasm build, so only the minimal defaults.qss gets applied, which means the QMenu, TaskView, and hover styling from FreeCAD.qss never loads—that's why the styling looks incomplete.

On a normal desktop install, I need to figure out what sets the StyleSheet default and whether it's a preference pack, a theme mechanism, or something in the parameters. The key fix is straightforward: set MainWindow/StyleSheet to "FreeCAD.qss" in the wasm build. But I should also verify that FreeCAD.qss can resolve its variables properly—it uses the StyleParameters manager and yaml files, so if those aren't loaded or packaged correctly, the stylesheet could still break ev  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy && echo \"=== yaml params packaged? ===\"; grep -o '[^\"]*parameters/[^\"]*\\.yaml' *.data.js 2>/dev/null | head; echo \"=== overlay qss ===\"; grep -o '[^\"]*Overlay[^\"]*' *.data…
tool result
=== yaml params packaged? ===
freecad.data.js:/freecad/share/Gui/Stylesheets/parameters/FreeCAD Dark.yaml
freecad.data.js:/freecad/share/Gui/Stylesheets/parameters/FreeCAD Light.yaml
=== overlay qss ===
freecad-mods.data.js:/freecad/Mod/PartDesign/Gui/Resources/icons/PartDesign_Overlay_Tip.svg
freecad-mods.data.js:/freecad/Mod/PartDesign/Gui/Resources/images/ThreadOverlay.svg
freecad.data.js:/freecad/share/Gui/Stylesheets/overlay/Freecad Overlay.qss
zshexit:1: parameter HISTDB_FD does not contai  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== variable syntax in FreeCAD.qss ===\"; grep -nE \"@\\{|\\$\\{|@[a-zA-Z]\" src/Gui/Stylesheets/FreeCAD.qss | head -10; echo \"=== replaceVariablesInQss impl ===\"; sed…
tool result
=== variable syntax in FreeCAD.qss ===
25:@PrimaryColor
26:@AccentColor
27:@GeneralAlternateBackgroundColor
28:@GeneralBackgroundColor
29:@GeneralBorderColor
30:@GeneralDisabledBackgroundColor
31:@GeneralGridLinesColor
33:@ButtonBottomBackgroundColor
34:@ButtonTopBackgroundColor
35:@GroupboxBackgroundColor
=== replaceVariablesInQss impl ===
QString Application::replaceVariablesInQss(const QString& qssText)
{
    return QString::fromStdString(d->styleParameterManager->replacePlaceholders(qssText.  …[truncated]
Fable
thinking
FreeCAD.qss uses placeholder variables that get resolved by the StyleParameters manager, pulling theme parameters from a YAML file specified by the Theme configuration parameter. The default theme is "Classic", which maps to the corresponding YAML file in the qss:parameters directory.

However, there's a mismatch: the packaged YAML files are only "FreeCAD Dark.yaml" and "FreeCAD Light.yaml" — there's no "Classic.yaml" file. This means when Theme is set to Classic, the YAML source fails to load and the variables remain unresolved. There might be a BuiltInParameterSource that provides fallback values, but I need to check the full deduceParametersFilePath function to understand the complete log  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && sed -n '430,465p' src/Gui/Application.cpp", "description": "read deduceParametersFilePath"}
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== migrateOldTheme ===\"; sed -n '/void.*migrateOldTheme/,/^}/p' src/Gui/StartupProcess.cpp | head -60", "description": "read migrateOldTheme"}
tool result
}

// Hook: invoke a functor on the GUI thread, either blocking or queued.
void qtInvokeOnMain(std::function<void()>&& fn, bool blocking)
{
    if (!qApp) {
        fn();
        return;
    }

    QMetaObject::invokeMethod(
        MainThreadInvoker::instance(),
        [f = std::move(fn)]() mutable { f(); },
        blocking ? Qt::BlockingQueuedConnection : Qt::QueuedConnection
    );
}

}  // namespace Gui

void Application::initStyleParameterManager()
{
    static ParamHandlers handlers;

    …[truncated]
tool result
=== migrateOldTheme ===
void StartupPostProcess::migrateOldTheme(const std::string& style)
{
    auto prefPackManager = Application::Instance->prefPackManager();

    if (style == "FreeCAD Light.qss") {
        prefPackManager->apply("FreeCAD Light");
    }
    else if (style == "FreeCAD Dark.qss") {
        prefPackManager->apply("FreeCAD Dark");
    }
}
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
I need to understand how the default theme gets applied when FreeCAD first launches on a fresh desktop install—whether there's a preference pack or built-in defaults being loaded. Let me trace through the PreferencePackManager and BuiltInParameterSource to see if they supply default colors for the Classic theme even without a YAML file, then figure out what combination of preferences creates that styled appearance.

The key insight is that in FreeCAD 1.1, the theme system changed to always use "FreeCAD.qss" as the stylesheet, with the Theme parameter selecting which color YAML to load. So on a fresh install, StyleSheet should be set to "FreeCAD.qss" and Theme should default to something like  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== FreeCAD.qss referenced as default/prefpack ===\"; grep -rn \"FreeCAD.qss\\|\\\"FreeCAD Light\\\"\\|\\\"FreeCAD Dark\\\"\\|SetASCII(\\\"StyleSheet\\\"\\|SetASCII(\\\"…
tool result
=== FreeCAD.qss referenced as default/prefpack ===
src/Gui/StartupProcess.cpp:345:        prefPackManager->apply("FreeCAD Light");
src/Gui/StartupProcess.cpp:348:        prefPackManager->apply("FreeCAD Dark");
src/Gui/PreferencePages/DlgSettingsGeneral.cpp:423:    hGrp->SetASCII("Theme", newTheme);
src/Gui/PreferencePages/DlgSettingsGeneral.cpp:479:            hGrp->SetASCII("Theme", similarTheme.toStdString());
src/Gui/PreferencePages/DlgSettingsGeneral.cpp:483:            hGrp->SetASCII("The  …[truncated]
Fable
thinking
I'm seeing how the theme system works on desktop—when FreeCAD starts fresh, the Start page shows a theme selector that applies a preference pack, which sets the stylesheet and theme properties like "FreeCAD Light" or "Dark" along with accent colors. The preference pack manager handles applying these configurations.

Now I need to check what parameters are actually defined in the FreeCAD Light preference pack configuration file to understand the complete set of settings I need to replicate for the web version—whether that's seeding them in a config file or setting them at startup.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && cat \"src/Gui/PreferencePacks/FreeCAD Light/FreeCAD Light.cfg\"", "description": "read FreeCAD Light preference pack"}
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy && echo \"=== prefpacks packaged? ===\"; grep -o '[^\"]*PreferencePacks[^\"]*' *.data.js 2>/dev/null | head; echo \"=== boot.py ===\"; cat boot.py", "description": "check prefpacks…
tool result
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<FCParameters>
  <FCParamGroup Name="Root">
    <FCParamGroup Name="BaseApp">
      <FCParamGroup Name="Preferences">
        <FCParamGroup Name="Editor">
          <FCUInt Name="Block comment" Value="730480128"/>
          <FCUInt Name="Bookmark" Value="192054528"/>
          <FCUInt Name="Breakpoint" Value="3374983680"/>
          <FCUInt Name="Character" Value="3374983680"/>
          <FCUInt Name="Class name" Value="2251201536"/>
        …[truncated]
tool result
=== prefpacks packaged? ===
freecad.data.js:PreferencePacks
freecad.data.js:/freecad/share/Gui/PreferencePacks
freecad.data.js:/freecad/share/Gui/PreferencePacks
freecad.data.js:/freecad/share/Gui/PreferencePacks
freecad.data.js:/freecad/share/Gui/PreferencePacks
freecad.data.js:/freecad/share/Gui/PreferencePacks/Dark behave/Dark behave.cfg
freecad.data.js:/freecad/share/Gui/PreferencePacks/FreeCAD Classic/FreeCAD Classic.cfg
freecad.data.js:/freecad/share/Gui/PreferencePacks/FreeCAD Classic/pos  …[truncated]
Fable
thinking
So the real issue is that no theme gets selected on startup, leaving the StyleSheet preference empty, which means only the bare defaults stylesheet gets loaded. I'm tracing through `StartupPostProcess::setStyleSheet()` in the startup code where it tries to read the saved stylesheet preference, but it's finding nothing.

On desktop, a fresh install triggers the theme selector widget which applies a theme like "FreeCAD Light" and writes that to the config. In the wasm environment, either that selector never runs or the user doesn't interact with it, so no theme ever gets set. There's also the persistence problem—even if a theme is selected, the config doesn't stick between sessions, so it reve  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== TaskView selectors in FreeCAD.qss ===\"; grep -n \"TaskView\\|QSint\\|taskPanel\\|TaskPanel\\|TaskBox\\|TaskHeader\\|background\" src/Gui/Stylesheets/FreeCAD.qss | g…
tool result
=== TaskView selectors in FreeCAD.qss ===
1513:Gui--TaskView--TaskPanel QSint--ActionPanel {
1519:QSint--ActionGroup {
1525:/* QSint--ActionGroup QGroupBox {
1531:/* QSint--ActionGroup QGroupBox::title {
1537:QSint--ActionGroup QFrame[height="1"],
1538:QSint--ActionGroup QFrame[height="1"],
1539:QSint--ActionGroup QFrame[height="1"],
1540:QSint--ActionGroup QFrame[width="1"],
1541:QSint--ActionGroup QFrame[width="1"],
1542:QSint--ActionGroup QFrame[width="1"] {
1547:QSint--ActionGroup QFrame[cla  …[truncated]
Fable
thinking
I found the exact line in the stylesheet where the task panel background is defined—it's pulling the color from the theme variables in FreeCAD Light.yaml. Since the stylesheet isn't being applied, the panel has no background, which explains why the text appears to be floating directly over the 3D view in the screenshot. Both the stylesheet and the theme configuration need to be loaded for this to work properly.

The cleanest approach is to apply the full "FreeCAD Light" preference pack through boot.py, which sets the stylesheet, theme, and accent colors all together—that's what the desktop version does. I can use the FreeCAD Python API to set these parameters directly and then reload the sty  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && echo \"=== ParamGet python (App) ===\"; grep -rn \"\\\"ParamGet\\\"\\|ParamGet\" src/App/Application.cpp | head -3; echo \"=== reloadStyleSheet / applyPreferencePack python exp…
tool result
=== ParamGet python (App) ===
=== reloadStyleSheet / applyPreferencePack python exposed in Gui ===
=== FreeCAD Classic cfg StyleSheet ===
          <FCText Name="OverlayActiveStyleSheet">Light Theme + Dark Background.qss</FCText>
          <FCText Name="StyleSheet"/>
          <FCText Name="Theme">FreeCAD Classic</FCText>
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
So FreeCAD Classic actually uses an empty stylesheet and relies on native Qt styling, which means the wasm build is essentially running in that unstyled state but without even the native Qt style plugin available. To get proper styling in the wasm environment, I need to use either the Light or Dark theme, which both apply the FreeCAD stylesheet along with their respective theme settings.

Now I should verify that ParamGet is indeed a standard FreeCAD Python function available through App.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD && grep -rn \"ParamGet\" src/App/Application.cpp src/App/FreeCADInit.py 2>/dev/null | head -3; echo \"---\"; grep -rln \"def ParamGet\\|\\\"ParamGet\\\"\\|sParamGet\\|ParamGet__do…
tool result
---
src/App/ApplicationPy.cpp
src/App/FreeCAD.module.pyi
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
I've confirmed that App.ParamGet is available in ApplicationPy.cpp and ParameterGrp has SetString in Python, so I have what I need to fully answer the Dimension A question. Now I'm verifying that changing the parameter from Python actually triggers the reload handler—it's registered through FreeCAD's ParameterGrp observer mechanism via the delayed handler for the MainWindow preferences and StyleSheet.

The handler fires when SetString is called, though "delayed" means it might batch on a timer, but it will still apply. The initStyleParameterManager handler is the active one during GUI startup, which happens before boot.py runs, so the timing works out. To be safe and immediate, I can set the  …
Fable
I have enough evidence for a complete root-cause and fix for Dimension A. Let me compose the structured answer.
Fable
⚙ StructuredOutput {"area": "A) Unstyled UI — missing Qt stylesheet (task panel has no background, no hover, plain context menus, oversized font)", "rootCause": "The `MainWindow/StyleSheet` preference is EMPTY in the wasm user.cfg, so FreeCAD only applies the…
tool result
Structured output provided successfully