subagent transcript

session 17f09f89 · workflow wf_1ced79bb
← 17f09f89 · archive
delegated task
FreeCAD is ported to WebAssembly (JSPI + native-EH, static CPython 3.14, no dlopen, no subprocess, single-thread, Qt 6.11). 17 workbenches already wor
▸ Magik
FreeCAD is ported to WebAssembly (JSPI + native-EH, static CPython 3.14, no dlopen, no subprocess, single-thread, Qt 6.11). 17 workbenches already work incl. Part/PartDesign/Sketcher/Measure/Draft/Assembly/TechDraw/Mesh + numpy + PySide6 + pivy._coin. Source tree: /home/magik6k/lcad-wasm/freecad-port/FreeCAD (branch wasm-parity-push). Build tree (already configured, DO NOT build — read only): /opt/toolchains/src/freecad-gui-build. The module-enablement pipeline is documented in the memory files at /home/magik6k/.claude/projects/-home-magik6k-lcad-wasm/memory/ (read freecad-wasm-parity-roadmap.md and freecad-wasm-viewport.md FIRST — they describe the src/Main/CMakeLists.txt inittab generator, FREECAD_WASM_EXTRA_PY_MODULES / FREECAD_WASM_EXTRA_LINK_LIBS, SHARED->STATIC conversion, data-packaging with file_packager, and known gotchas). Constraints that shape feasibility: NO subprocess/fork/exec, NO dlopen (all C-ext modules static via inittab), NO threads (QThreadPool/QtConcurrent absent), NO listen sockets, wasm32 4GB ceiling. C++ deps must be new-EH (-fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0). Pure-Python addons are fine; native ones need static linking. Your job: READ ONLY. Do not edit source, do not run cmake/ninja/emcc. Produce an actionable plan a build engineer can execute. Solve the DEFERRED persistence RELOAD-LOAD bug. SAVE works (user.cfg lands at /tmp/.config/FreeCAD/v26-3/user.cfg + IDBFS persists across reload), but on reload the in-memory ParameterManager reads prev_marker=<none> — the hydrated user.cfg is not loaded into the live manager. Root-cause it precisely: is it (a) IDBFS syncfs(true) hydrate not completing before initConfig/LoadParameters (the index.html addRunDependency gate not actually holding main), or (b) LoadDocument not repopulating GetGroup? Read src/App/Application.cpp (LoadParameters, the __EMSCRIPTEN__ re-point + create_dirs + LoadDocument), src/Base/Parameter*.cpp (ParameterManager LoadDocument/serializer), deploy/index.html (the fc-idbfs-hydrate addRunDependency + FS.syncfs(true) gate + preRun ordering). Give the exact fix (file + edit) and how to verify. This is high-value (user prefs/recent-files persistence).
Fable
thinking
I'm diving into a persistence bug in the FreeCAD WebAssembly port and need to examine the relevant code to understand what's going wrong.
Fable
⚙ Bash {"command": "cat /home/magik6k/.claude/projects/-home-magik6k-lcad-wasm/memory/freecad-wasm-viewport.md", "description": "Read viewport memory file"}
tool result
---
name: freecad-wasm-viewport
description: How the FreeCAD-wasm 3D viewport was made to render (offscreen FBO + QPainter blit) and the asyncify-safe way to create a 3D view
metadata: 
  node_type: memory
  type: project
  originSessionId: 18e25685-98b5-4959-935f-943b1af20789
---

FreeCAD WebAssembly port (/home/magik6k/lcad-wasm/freecad-port/FreeCAD, build dir /opt/toolchains/src/freecad-gui-build). The 3D viewport now RENDERS (gradient background, navigation cube, RGB axis cross all composite  …[truncated]
Fable
⚙ Bash {"command": "ls -la /home/magik6k/lcad-wasm/freecad-port/FreeCAD/deploy/ 2>/dev/null; echo \"---\"; find /home/magik6k/lcad-wasm/freecad-port/FreeCAD/deploy -name \"index.html\" 2>/dev/null", "description": "List deploy dir"}
tool result
---
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The deploy directory appears to be empty, so I need to locate where the actual files are stored.
Fable
⚙ Bash {"command": "ls deploy 2>/dev/null; echo \"=== find index.html ===\"; find /home/magik6k/lcad-wasm -maxdepth 4 -name \"index.html\" 2>/dev/null; echo \"=== find deploy dirs ===\"; find /home/magik6k/lcad-wasm -maxdepth 3 -type d -name deplo…
tool result
=== find index.html ===
/home/magik6k/lcad-wasm/deploy/index.html
/home/magik6k/lcad-wasm/deploy-debug/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy-t1/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy-gui/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy-jspi/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy-jspi-verify/index.html
/home/magik6k/lcad-wasm/freecad-port/deploy-va/index.html
/home/magik6k/lcad-wasm/opens  …[truncated]
Fable
⚙ Bash {"command": "grep -n \"EMSCRIPTEN\\|LoadParameters\\|syncfs\\|IDBFS\" src/App/Application.cpp | head -80", "description": "Grep Application.cpp for relevant symbols"}
tool result
445:    LoadParameters();
2835:#ifdef __EMSCRIPTEN__
2843:    // no-ops and nothing persists to the IDBFS mount. Doing it here (not only in
2844:    // LoadParameters()'s bootstrap guard) makes persistence deterministic.
2964:    LoadParameters();
2966:#ifdef __EMSCRIPTEN__
2967:    // wasm: make the just-initialized managers reflect the IDBFS-hydrated config.
3345:void Application::LoadParameters()
3351:#ifdef __EMSCRIPTEN__
3354:        // path ("/user.cfg"): saveParameter() cannot persist and  …[truncated]
Fable
thinking
I need to look at the Application.cpp file to understand how parameters are loaded, particularly focusing on the EMSCRIPTEN-specific sections and the main port directory at /home/magik6k/lcad-wasm/freecad-port/FreeCAD.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp", "offset": 2820, "limit": 180}
tool result
2820	        };
2821	        parseProgramOptions(argc, argv, mConfig["ExeName"], vm);
2822	    }
2823	
2824	    if (vm.contains("keep-deprecated-paths")) {
2825	        mConfig["KeepDeprecatedPaths"] = "1";
2826	    }
2827	
2828	    if (vm.contains("safe-mode")) {
2829	        mConfig["SafeMode"] = "1";
2830	    }
2831	
2832	    // extract home paths
2833	    _appDirs = std::make_unique<ApplicationDirectories>(mConfig);
2834	
2835	#ifdef __EMSCRIPTEN__
2836	    // The parameter managers are crea  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp", "offset": 3345, "limit": 140}
tool result
3345	void Application::LoadParameters()
3346	{
3347	    // Idempotent: on wasm bootstrapEarly() may load parameters before main's
3348	    // initConfig() reaches this point; don't recreate the managers (which are
3349	    // already referenced by the singleton's mpcPramManager map).
3350	    if (_pcUserParamMngr && _pcSysParamMngr) {
3351	#ifdef __EMSCRIPTEN__
3352	        // bootstrapEarly() creates the managers at module-load, before the user
3353	        // config path is resolvable, so thei  …[truncated]
Fable
thinking
I'm tracing through the reload sequence and noticing the prev_marker shows as none even though the file should be hydrated. The issue seems to be a timing problem where the IDBFS syncfs call hasn't finished populating the filesystem before the ParameterManager tries to load the configuration.

Looking at the bootstrap order, the managers get created early, then LoadParameters is called which re-points and loads the document again, followed by another re-point and LoadDocument block. The real question is whether the file actually exists on the filesystem at the moment LoadDocument checks it, or if LoadDocument is being called but not properly repopulating the manager's internal state.

I need  …
Fable
⚙ Bash {"command": "grep -n \"bootstrapEarly\\|syncfs\\|FS.syncfs\\|IDBFS\\|addRunDependency\\|removeRunDependency\\|fc-idbfs\\|hydrate\\|preRun\\|prev_marker\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp", "description": …
tool result
424:    // On wasm the singleton may be created early (bootstrapEarly, before
434:void Application::bootstrapEarly()
2836:    // The parameter managers are created at module load (bootstrapEarly) BEFORE
2843:    // no-ops and nothing persists to the IDBFS mount. Doing it here (not only in
2967:    // wasm: make the just-initialized managers reflect the IDBFS-hydrated config.
2970:    // file is on the (hydrated) FS. Re-point to the authoritative target and
3096:    // On wasm the singleton may a  …[truncated]
Fable
⚙ Bash {"command": "grep -rn \"bootstrapEarly\\|syncfs\\|prev_marker\\|IDBFS\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/ 2>/dev/null | head -40", "description": "Grep source tree"}
tool result
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.h:1022:    static void bootstrapEarly();
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.h:1109:        App::Application::bootstrapEarly();
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/ApplicationPy.cpp:638:        // stage with a stale path ("/user.cfg", not under the IDBFS mount), so the
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp:424:    // On wasm the singleton may be created   …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp", "offset": 418, "limit": 80}
tool result
418	#ifndef FC_OS_WASM
419	    // Single-threaded wasm build: no worker; queueRecomputeRequest() always
420	    // takes the inline path (canRecomputeRequestOnWorker returns false).
421	    _recomputeThread = std::thread(&Application::recomputeWorker, this);
422	#endif
423	
424	    // On wasm the singleton may be created early (bootstrapEarly, before
425	    // Py_Initialize) to satisfy Gui/Mod global constructors that read the
426	    // parameter system. Defer Python-type registration until th  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.h", "offset": 1095, "limit": 30}
tool result
1095	
1096	    static Base::ConsoleObserverStd  *_pConsoleObserverStd;
1097	    static Base::ConsoleObserverFile *_pConsoleObserverFile;
1098	};
1099	
1100	/**
1101	 * @brief Get the singleton Application instance.
1102	 * @ingroup ApplicationGroup
1103	 */
1104	inline App::Application &GetApplication(){
1105	#ifdef FC_OS_WASM
1106	    // Static-init-order guard: Gui/Mod global constructors may reach the
1107	    // application before main() runs init(). Bring it up on demand.
1108	    if (!App:  …[truncated]
Fable
thinking
I'm tracing through the initialization sequence in emscripten—`bootstrapEarly()` gets called during module load from global constructors, which happens when the wasm module instantiates inside `run()` after `preRun` completes and the filesystem is ready, specifically when `__wasm_call_ctors` executes before `main`.

The critical piece is that if IDBFS hydration is set up as a run dependency in `preRun`, then `run()` should wait for that to finish before proceeding to the constructor phase and main. But the bug report suggests this gate isn't actually holding—the global constructors and main are running before the hydration completes. I need to check the actual index.html to see if the addRun  …
Fable
⚙ Bash {"command": "grep -n \"syncfs\\|IDBFS\\|addRunDependency\\|removeRunDependency\\|fc-idbfs\\|hydrate\\|preRun\\|mkdir\\|mount\\|FS\\.\\|Module\\b\\|user.cfg\\|\\.config\" /home/magik6k/lcad-wasm/freecad-port/deploy/index.html | head -80", "d…
tool result
48:  var Module = {
55:    preRun: [(M) => {
56:      // ---- P0 browser persistence: hydrate IDBFS-backed config/data dirs ----
58:      //   UserConfigPath = /tmp/.config/FreeCAD/  -> user.cfg  (ALL prefs +
60:      //   QSettings      = /tmp/.config/FreeCAD/FreeCAD.conf (MainWindow QSettings)
62:      // Mount IndexedDB-backed IDBFS over those two roots so they survive reload.
65:      const IDBFS = FS.filesystems.IDBFS;
66:      ['/tmp/.config', '/tmp/.local', '/tmp/.local/share'].forEach((p  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/deploy/index.html", "offset": 44, "limit": 135}
tool result
44	  const statusEl = document.getElementById('status');
45	  const bootEl   = document.getElementById('boot');
46	  const barEl    = document.querySelector('#bootbar > div');
47	  const setStatus = (s) => { statusEl.textContent = s; };
48	  var Module = {
49	    qtContainerElements: [screenEl],
50	    arguments: [],
51	    // Qt-wasm has no system font -> defaults to 12pt Helvetica @96dpi (~16px, too
52	    // big). Lower the logical DPI so the UI font/metrics match desktop (~10pt).
53	    // R  …[truncated]
Fable
thinking
Looking at how Emscripten's preRun callbacks work—they execute in order during the `run()` function before `initRuntime()` is called. The first callback mounts IDBFS and triggers `addRunDependency` plus `syncfs(true)`, which is correct. The critical piece is understanding how `run()` checks the run dependency counter to determine when initialization can proceed.

The execution flow is: `preRun()` callbacks run first, then if `runDependencies > 0`, the function returns and waits. Once `removeRunDependency()` brings the counter to zero, it calls `doRun()`, which runs the global C++ constructors and main. Since the hydrate operation completes before the dependency counter drops, the constructor  …
Fable
⚙ Bash {"command": "ls /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter*; echo \"===\"; grep -n \"LoadDocument\\|LoadOrCreateDocument\\|CreateDocument\\|SetSerializer\\|::Load\\|Serializer\\|Clear\\|_paramGrp\\|prev_marker\\|CheckDo…
tool result
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.h
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/ParameterObserver.cpp
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/ParameterObserver.h
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/ParameterPy.cpp
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/ParameterPy.h
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.xsd
===
106:cl  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1800, "limit": 130}
tool result
1800	
1801	int getTimeout()
1802	{
1803	    const int timeout = 5000;
1804	    return timeout;
1805	}
1806	}  // namespace
1807	
1808	//**************************************************************************
1809	// Document handling
1810	
1811	bool ParameterManager::LoadOrCreateDocument(const char* sFileName)
1812	{
1813	    Base::FileInfo file(sFileName);
1814	    if (file.exists()) {
1815	        LoadDocument(sFileName);
1816	        return false;
1817	    }
1818	
1819	    CreateDocument()  …[truncated]
Fable
thinking
I'm wondering whether `LoadDocument` actually refreshes the cached parameter tree when it updates `_pDocument` and `_pGroupNode`, or if the existing ParameterGrp objects—which likely inherit from ParameterGrp itself—still hold stale references to the old DOM nodes through their internal group map.

The issue becomes clear on wasm: bootstrapEarly loads an empty user.cfg and creates the managers, then global constructors immediately call GetGroup to cache child ParameterGrp objects pointing into that empty document's DOM. When initConfig later calls LoadDocument with the real user.cfg, it replaces the document and the manager's own group node, but those already-cached child groups still refere  …
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1651, "limit": 140}
tool result
1651	    //      Indicates whether entity reference nodes needs to be created or not.
1652	    //      Defaults to false.
1653	    //
1654	    //  gOutputEncoding
1655	    //      The encoding we are to output in. If not set on the command line,
1656	    //      then it is defaults to the encoding of the input XML file.
1657	    //
1658	    //  gMyEOLSequence
1659	    //      The end of line sequence we are to output.
1660	    //
1661	    //  gSplitCdataSections
1662	    //      Indicates whethe  …[truncated]
Fable
thinking
I'm examining the ParameterManager constructor to understand how it connects with the ParameterGrp _pGroupNode and how the manager's root group node relates to the ParameterGrp base class.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1616, "limit": 40}
tool result
1616	//**************************************************************************
1617	//**************************************************************************
1618	// ParameterManager
1619	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1620	
1621	static XercesDOMParser::ValSchemes gValScheme = XercesDOMParser::Val_Auto;  // NOLINT
1622	
1623	//**************************************************************************
1624	// Construction/Destruction
1625	
1626	  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 2031, "limit": 70}
tool result
2031	void ParameterManager::CreateDocument()
2032	{
2033	    // creating a document from screatch
2034	    DOMImplementation* impl = DOMImplementationRegistry::getDOMImplementation(
2035	        XStrLiteral("Core").unicodeForm()
2036	    );
2037	    delete _pDocument;
2038	    _pDocument = impl->createDocument(
2039	        nullptr,                                    // root element namespace URI.
2040	        XStrLiteral("FCParameters").unicodeForm(),  // root element name
2041	        nullptr
  …[truncated]
Fable
thinking
I'm investigating whether ParameterManager caches child ParameterGrp references that could become stale when the underlying group node or document changes. I need to examine how ParameterGrp stores its group node and manages the child group map, particularly in the GetGroup implementation.
Fable
⚙ Bash {"command": "grep -n \"_GroupMap\\|_pGroupNode\\|_GetGroup\\|GetGroup\\|class ParameterGrp\\|class ParameterManager\\|_Manager\\|Notify\\|RefreshDocument\\|Reset\\|_Reset\\|revalidate\\|Reload\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/…
tool result
77:class ParameterManager;
176:    Base::Reference<ParameterGrp> GetGroup(const char* Name);
183:    std::vector<Base::Reference<ParameterGrp>> GetGroups();
401:    friend class ParameterManager;
404:    const char* GetGroupName() const
415:    void NotifyAll();
423:        return _Manager;
435:    /// helper function for GetGroup
436:    Base::Reference<ParameterGrp> _GetGroup(const char* Name);
439:    void _Reset();
442:    void _Notify(ParamType Type, const char* Name, const char*   …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1280, "limit": 120}
tool result
1280	}
1281	
1282	std::vector<std::pair<std::string, Base::Color>> ParameterGrp::GetColorMap(const char* sFilter) const
1283	{
1284	    auto packed = GetUnsignedMap(sFilter);
1285	    std::vector<std::pair<std::string, Base::Color>> result;
1286	
1287	    std::transform(
1288	        packed.begin(),
1289	        packed.end(),
1290	        std::back_inserter(result),
1291	        [](const std::pair<std::string, unsigned long>& lValue) {
1292	            return std::make_pair(lValue.first, Color(s  …[truncated]
Fable
thinking
I need to check whether `_GetGroup` invalidates the cached child groups in `_GroupMap` when `LoadDocument` updates the manager's `_pDocument` and `_pGroupNode` references.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1160, "limit": 120}
tool result
1160	    }
1161	
1162	    DOMNode* node = _pGroupNode->removeChild(pcElem);
1163	    node->release();
1164	
1165	    // trigger observer
1166	    _Notify(ParamType::FCText, Name, nullptr);
1167	    Notify(Name);
1168	}
1169	
1170	void ParameterGrp::RemoveBool(const char* Name)
1171	{
1172	    if (!_pGroupNode) {
1173	        return;
1174	    }
1175	
1176	    // check if Element in group
1177	    DOMElement* pcElem = FindElement(_pGroupNode, "FCBool", Name);
1178	    // if not return
1179	    if   …[truncated]
Fable
⚙ Bash {"command": "grep -n \"ParameterGrp::_GetGroup\\|ParameterGrp::GetGroup\\|Base::Reference<ParameterGrp> ParameterGrp\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "description": "Find GetGroup impl"}
tool result
380:Base::Reference<ParameterGrp> ParameterGrp::GetGroup(const char* Name)
409:Base::Reference<ParameterGrp> ParameterGrp::_GetGroup(const char* Name)
469:std::vector<Base::Reference<ParameterGrp>> ParameterGrp::GetGroups()
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 380, "limit": 120}
tool result
380	Base::Reference<ParameterGrp> ParameterGrp::GetGroup(const char* Name)
381	{
382	    if (!Name) {
383	        throw Base::ValueError("Empty group name");
384	    }
385	
386	    Base::Reference<ParameterGrp> hGrp = this;
387	    std::vector<std::string> tokens;
388	    boost::split(tokens, Name, boost::is_any_of("/"));
389	    for (auto& token : tokens) {
390	        boost::trim(token);
391	        if (token.empty()) {
392	            continue;
393	        }
394	        hGrp = hGrp->_GetGroup  …[truncated]
Fable
thinking
So the `_GetGroup` method caches child parameter groups in `_GroupMap`, where each cached group maintains a pointer to a DOM element within the manager's document. The issue is at line 431—when a group already exists in the cache, it returns that cached instance without re-resolving its DOM pointer against the new document, which could be problematic.

The sequence on reload is: bootstrapEarly creates managers with an empty document, global constructors call `GetGroup` and cache child groups pointing into that empty DOM, then initConfig loads the real user config file and updates the manager's document pointer to the new root—but the cached child groups still reference nodes from the old emp  …
Fable
⚙ Bash {"command": "grep -n \"_Reset\\|::Notify\\|NotifyAll\\|_pGroupNode =\\|_pGroupNode=\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "description": "Find _Reset and node assignments"}
tool result
1550:void ParameterGrp::NotifyAll()
1583:void ParameterGrp::_Reset()
1585:    _pGroupNode = nullptr;
1587:        v.second->_Reset();
1698:    _Reset();
1921:    _pGroupNode = FindElement(rootElem, "FCParamGroup", "Root");
2046:    _pGroupNode = _pDocument->createElement(XStrLiteral("FCParamGroup").unicodeForm());
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp", "offset": 1548, "limit": 70}
tool result
1548	}
1549	
1550	void ParameterGrp::NotifyAll()
1551	{
1552	    // get all ints and notify
1553	    std::vector<std::pair<std::string, long>> IntMap = GetIntMap();
1554	    for (const auto& it : IntMap) {
1555	        Notify(it.first.c_str());
1556	    }
1557	
1558	    // get all booleans and notify
1559	    std::vector<std::pair<std::string, bool>> BoolMap = GetBoolMap();
1560	    for (const auto& it : BoolMap) {
1561	        Notify(it.first.c_str());
1562	    }
1563	
1564	    // get all Float  …[truncated]
Fable
thinking
I'm working through how cached groups behave when documents are reloaded. The desktop version doesn't rebind cached groups on load since upstream typically doesn't reload documents with live cached groups, but FreeCAD does support reloading through operations like Revert or parameter changes. I need to find where the tree gets re-resolved after LoadDocument, possibly in the calling code or through a specific method that handles rebinding.

Looking at how GetGroup handles a stale `_pGroupNode` — it uses the cached group without re-checking against the current document, so there's no automatic rebind happening. When LoadDocument updates the manager's `_pGroupNode` to point to the new Root, the  …
Fable
⚙ Bash {"command": "grep -rn \"prev_marker\\|marker\\|SaveParameter\\|saveParameter\\|GetParameterGroupByPath\\|reload\" /home/magik6k/lcad-wasm/freecad-port/deploy/boot.py /home/magik6k/lcad-wasm/deploy/boot.py 2>/dev/null | head -40; echo \"=== …
tool result
=== boot.py files ===
/home/magik6k/lcad-wasm/freecad-port/deploy-jspi-verify/boot.py
/home/magik6k/lcad-wasm/freecad-port/deploy-va/boot.py
/home/magik6k/lcad-wasm/freecad-port/deploy/boot.py
/home/magik6k/lcad-wasm/freecad-port/deploy-m3-backup/boot.py
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "grep -n \"marker\\|Param\\|param\\|cfg\\|persist\\|Recent\\|prev\" /home/magik6k/lcad-wasm/freecad-port/deploy/boot.py | head -40", "description": "Search boot.py for param markers"}
tool result
13:    n=len(Gui.listWorkbenches()); mw=App.ParamGet("User parameter:BaseApp/Preferences/MainWindow")
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
I'm tracing through the parameter retrieval chain to understand where the staleness issue originates. The `prev_marker` appears to come from a test harness, and when `App.ParamGet` is called with a user parameter, it flows through `Application::GetParameterGroupByPath` and eventually reaches `_pcUserParamMngr->GetGroup()`, which is where the stale data problem surfaces.
Fable
⚙ Bash {"command": "grep -n \"GetParameterGroupByPath\\|GetUserParameter\\|_pcUserParamMngr->GetGroup\\|ParameterManager::GetGroup\\|GetParameterSet\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp | head", "description": "Fi…
tool result
856:    static const ParameterGrp::handle hGrp = GetParameterGroupByPath(
865:    static const ParameterGrp::handle hGrp = GetParameterGroupByPath(
1034:    ParameterGrp::handle hGrp = GetParameterGroupByPath("User parameter:BaseApp/Preferences/Document");
1547:ParameterManager & Application::GetUserParameter()
1552:ParameterManager * Application::GetParameterSet(const char* sName) const
1560:Application::GetParameterSetList() const
1582:Base::Reference<ParameterGrp>  Application::GetParameterGr  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/App/Application.cpp", "offset": 1582, "limit": 30}
tool result
1582	Base::Reference<ParameterGrp>  Application::GetParameterGroupByPath(const char* sName)
1583	{
1584	    std::string cName = sName, cTemp;
1585	
1586	    const std::string::size_type pos = cName.find(':');
1587	
1588	    // is there a path separator ?
1589	    if (pos == std::string::npos) {
1590	        throw Base::ValueError("Application::GetParameterGroupByPath() no parameter set name specified");
1591	    }
1592	    // assigning the parameter set name
1593	    cTemp.assign(cName,0,pos);
1  …[truncated]
Fable
thinking
So the issue is that when `App.ParamGet` calls down through `GetParameterGroupByPath` to retrieve a parameter group, it's hitting a cached version that was populated during the empty bootstrap phase. That cached group's internal DOM node still points to the old empty structure, so when it tries to read the parameter value, it finds nothing and `prev_marker` ends up empty. The real question is whether that child group was actually cached during bootstrap—it would only be if something triggered `GetGroup` on that exact path before the actual data loaded.

But even if the specific marker path wasn't touched, the intermediate groups definitely were. When bootstrap code calls `GetGroup("BaseApp/P  …
Fable
⚙ Bash {"command": "grep -n \"FindElement\\|CreateElement\\|DOMElement \\*FindElement\\|::FindElement\\|::CreateElement\\|static.*FindElement\\|static.*CreateElement\" /home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.cpp | head; ech…
tool result
352:DOMElement* ParameterGrp::CreateElement(DOMElement* Start, const char* Type, const char* Name)
358:            "CreateElement: %s cannot have the element %s of type %s\n",
428:    pcTemp = FindElement(_pGroupNode, "FCParamGroup", Name);
433:            pcTemp = CreateElement(_pGroupNode, "FCParamGroup", Name);
480:    DOMElement* pcTemp = FindElement(_pGroupNode, "FCParamGroup");
512:    if (_pGroupNode && FindElement(_pGroupNode, "FCParamGroup", Name) != nullptr) {
618:    DOMElement*  …[truncated]
Fable
thinking
I need to examine the signatures of FindElement and CreateElement, then look at the header section around lines 435-495 to figure out how to design and place the rebind method.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.h", "offset": 395, "limit": 100}
tool result
395	     */
396	    std::vector<std::string> GetASCIIs(const char* sFilter = nullptr) const;
397	    /// Same as GetASCIIs() but with key,value map
398	    std::vector<std::pair<std::string, std::string>> GetASCIIMap(const char* sFilter = nullptr) const;
399	    //@}
400	
401	    friend class ParameterManager;
402	
403	    /// returns the name
404	    const char* GetGroupName() const
405	    {
406	        return _cName.c_str();
407	    }
408	
409	    /// return the full path of this group
410	    …[truncated]
Fable
thinking
I need to check the ParameterManager class declaration to find where to add a public method and verify it inherits from ParameterGrp, then look at the LoadDocument declarations.
Fable
⚙ Bash {"command": "grep -n \"class BaseExport ParameterManager\\|class ParameterManager\\|public ParameterGrp\\|int LoadDocument\\|void CreateDocument\\|LoadOrCreateDocument\\|void SaveDocument\\|RefreshGroups\\|NotifyAll\" /home/magik6k/lcad-was…
tool result
77:class ParameterManager;
401:    friend class ParameterManager;
415:    void NotifyAll();
517:    virtual void SaveDocument(const ParameterManager&);
518:    virtual int LoadDocument(ParameterManager&);
519:    virtual bool LoadOrCreateDocument(ParameterManager&);
537:class BaseExport ParameterManager: public ParameterGrp
571:    int LoadDocument(const char* sFileName);
572:    int LoadDocument(const XERCES_CPP_NAMESPACE::InputSource&);
573:    bool LoadOrCreateDocument(const char* sF  …[truncated]
Fable
thinking
I've confirmed that `ParameterManager` inherits from `ParameterGrp`. The core issue is that after rebinding, observers like `ViewParams` need to be notified of the new values since they cache data in their members, but the immediate symptom is that direct calls to `App.ParamGet(...).GetInt(...)` return stale values until rebind is triggered. Once rebind happens, the direct read works, though cached observer values still need notification to update.

I'm considering whether a simpler fix would be to destroy and recreate the managers fresh during the wasm reload, but that would orphan the existing `ParameterGrp::handle` references that `ViewParams` and other global-constructor code already hol  …
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Base/Parameter.h", "offset": 537, "limit": 60}
tool result
537	class BaseExport ParameterManager: public ParameterGrp
538	{
539	public:
540	    /// Create a reference counted ParameterManager
541	    static Base::Reference<ParameterManager> Create();
542	    static void Init();
543	    static void Terminate();
544	
545	    /** Signal on parameter changes
546	     *
547	     * The signal is triggered on adding, removing, renaming or modifying on
548	     * all individual parameters and group. The signature of the signal is
549	     * \code
550	     *      …[truncated]
Fable
thinking
I'm finalizing the code changes with precise diffs, starting with adding documentation to Parameter.h that explains how cached sub-group handles get re-resolved when the underlying XML document reloads.

Writing the implementation...

The fix is straightforward—roughly 1-2 hours of work including rebuild and verification, with high impact since it eliminates the root cause entirely. No blocking issues, just a tractable solution.
Fable
I have root-caused the bug definitively. Let me compile the findings.
Fable
⚙ StructuredOutput {"area": "FreeCAD-wasm DEFERRED persistence: reload does not repopulate the live ParameterManager (user.cfg/prefs/recent-files)", "verdict": "tractable-now", "effortHours": "1-2", "valueToUsers": "high", "filesInspected": ["/home/magik6k/lc…
tool result
Structured output provided successfully