Start: set specific zoom level for new BIM projects (#20271)

* Gui: allow viewDefaultOrientation function to accept the None value, as per the docstring

* Start, BIM: set specific zoom level for new BIM projects

src/Gui/View3DPy.cpp

@@ -553,7 +553,7 @@ Py::Object View3DInventorPy::viewDefaultOrientation(const Py::Tuple& args)
 {
     char* view = nullptr;
     double scale = -1.0;
-    if (!PyArg_ParseTuple(args.ptr(), "|sd", &view, &scale))
+    if (!PyArg_ParseTuple(args.ptr(), "|zd", &view, &scale))
         throw Py::Exception();
 
     try {

src/Mod/Start/Gui/StartView.cpp

@@ -330,6 +330,11 @@ void StartView::newArchFile() const
     catch (...) {
         Gui::Application::Instance->activateWorkbench("ArchWorkbench");
     }
+
+    // Set the camera zoom level to 10 m, which is more appropriate for architectural projects
+    Gui::Command::doCommand(
+        Gui::Command::Gui,
+        "Gui.activeDocument().activeView().viewDefaultOrientation(None, 10000.0)");
     postStart(PostStartBehavior::doNotSwitchWorkbench);
 }