PartDesign: Add preview TaskBox to all feature task dialogs

src/Mod/PartDesign/App/FeatureTransformed.cpp

@@ -222,6 +222,45 @@ short Transformed::mustExecute() const
     }
     return PartDesign::Feature::mustExecute();
 }
+
+App::DocumentObjectExecReturn* Transformed::recomputePreview()
+{
+    const auto mode = static_cast<Mode>(TransformMode.getValue());
+
+    const auto makeCompoundOfToolShapes = [this]() {
+        BRep_Builder builder;
+        TopoDS_Compound compound;
+
+        builder.MakeCompound(compound);
+        for (const auto& original : getOriginals()) {
+            if (auto* feature = freecad_cast<FeatureAddSub*>(original)) {
+                const auto& shape = feature->AddSubShape.getShape();
+
+                if (shape.isNull()) {
+                    continue;
+                }
+
+                builder.Add(compound, shape.getShape());
+            }
+        }
+
+        return compound;
+    };
+
+    switch (mode) {
+        case Mode::TransformToolShapes:
+            PreviewShape.setValue(makeCompoundOfToolShapes());
+            return StdReturn;
+
+        case Mode::TransformBody:
+            PreviewShape.setValue(getBaseShape());
+            return StdReturn;
+
+        default:
+            return FeatureRefine::recomputePreview();
+    }
+}
+
 void Transformed::onChanged(const App::Property* prop)
 {
     if (prop == &TransformMode) {