Core: Change placement dialog to operate on passed selection objects

src/Gui/CommandDoc.cpp

@@ -1562,6 +1562,7 @@ void StdCmdPlacement::activated(int iMsg)
             plm->setPropertyName(QLatin1String("Placement"));
             plm->setSelection(selection);
             plm->bindObject();
+            plm->clearSelection();
         }
     }
     Gui::Control().showDialog(plm);

src/Gui/Placement.cpp

@@ -195,7 +195,21 @@ std::vector<App::DocumentObject*> PlacementHandler::getObjects(Gui::Document* do
 
 std::vector<App::DocumentObject*> PlacementHandler::getSelectedObjects(Gui::Document* document) const
 {
-    return Gui::Selection().getObjectsOfType(App::DocumentObject::getClassTypeId(), document->getDocument()->getName());
+    App::Document* doc = document->getDocument();
+    std::vector<App::DocumentObject*> list;
+    list.reserve(selectionObjects.size());
+    for (const auto& it : selectionObjects) {
+        const App::DocumentObject* obj = it.getObject();
+        if (obj && obj->getDocument() == doc) {
+            list.push_back(const_cast<App::DocumentObject*>(obj));  // NOLINT
+        }
+    }
+
+    if (!list.empty()) {
+        return list;
+    }
+
+    return Gui::Selection().getObjectsOfType(App::DocumentObject::getClassTypeId(), doc->getName());
 }
 
 void PlacementHandler::revertTransformationOfViewProviders(Gui::Document* document)
@@ -1073,6 +1087,15 @@ void TaskPlacement::setSelection(const std::vector<Gui::SelectionObject>& select
     widget->setSelection(selection);
 }
 
+/*!
+ * \brief TaskPlacement::clearSelection
+ * Clears the array of selection objects.
+ */
+void TaskPlacement::clearSelection()
+{
+    widget->setSelection({});
+}
+
 /*!
  * \brief TaskPlacement::bindObject
  * Binds the spin boxes to the placement components of the first object of the selection.

src/Gui/Placement.h

@@ -187,6 +187,7 @@ public:
     void setPropertyName(const QString&);
     void setPlacement(const Base::Placement&);
     void setSelection(const std::vector<SelectionObject>&);
+    void clearSelection();
     void bindObject();
     bool accept() override;
     bool reject() override;