Sketcher: Allow live preview of sketch placement (#26033)

along with unit tests

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -3123,22 +3123,54 @@ void ViewProviderSketch::drawEditMarkers(const std::vector<Base::Vector2d>& Edit
 }
 
 void ViewProviderSketch::updateData(const App::Property* prop) {
-    if (std::string(prop->getName()) != "ShapeMaterial") {
-        // We don't want material to override the colors of sketches.
-        ViewProvider2DObject::updateData(prop);
-    }
-
     if (prop == &getSketchObject()->InternalShape) {
         const auto& shape = getSketchObject()->InternalShape.getValue();
         setupCoinGeometry(shape,
-                          pcSketchFaces,
-                          Deviation.getValue(),
-                          AngularDeflection.getValue());
+                pcSketchFaces,
+                Deviation.getValue(),
+                AngularDeflection.getValue());
     }
 
     if (prop != &getSketchObject()->Constraints) {
         signalElementsChanged();
     }
+
+    // clang-format on
+    // update placement changes while in edit mode
+    if (isInEditMode() && prop) {
+        // check if the changed property is `placement` or `attachmentoffset`
+        if (strcmp(prop->getName(), "Placement") == 0
+            || strcmp(prop->getName(), "AttachmentOffset") == 0) {
+
+#ifdef FC_DEBUG
+            Base::Console().warning("updating editing transform!\n");
+#endif
+            // recalculate the placement matrix
+            Sketcher::SketchObject* sketchObj = getSketchObject();
+            if (sketchObj) {
+                // use globalPlacement for both attached and unattached sketches
+                Base::Placement plm = sketchObj->Placement.getValue();
+
+#ifdef FC_DEBUG
+                // log what is actually being set
+                Base::Console().warning(
+                    "Placement: pos=(%f,%f,%f)\n",
+                    plm.getPosition().x,
+                    plm.getPosition().y,
+                    plm.getPosition().z
+                );
+#endif
+
+                // update the document's editing transform
+                getDocument()->setEditingTransform(plm.toMatrix());
+            }
+        }
+    }
+    if (std::string(prop->getName()) != "ShapeMaterial") {
+        // We don't want material to override the colors of sketches.
+        ViewProvider2DObject::updateData(prop);
+    }
+    // clang-format off
 }
 
 void ViewProviderSketch::slotSolverUpdate()