[TD]allow multiple primitives in complex selections

src/Mod/TechDraw/Gui/DrawGuiUtil.cpp

@@ -612,3 +612,16 @@ Base::Vector3d DrawGuiUtil::toGuiPoint(DrawView* obj, const Base::Vector3d& toCo
     return result;
 }
 
+
+//! true if targetObj is in the selection list
+bool DrawGuiUtil::findObjectInSelection(const std::vector<Gui::SelectionObject>& selection,
+                                        const App::DocumentObject& targetObject)
+{
+    for (auto& selObj : selection) {
+        if (&targetObject == selObj.getObject()) {
+            return true;
+        }
+    }
+    return false;
+}
+

src/Mod/TechDraw/Gui/DrawGuiUtil.h

@@ -27,18 +27,16 @@
 #include <QCoreApplication>
 #include <QGraphicsItem>
 
+#include <App/DocumentObject.h>
 #include <Base/Vector3D.h>
+#include <Gui/Selection.h>
 #include <Mod/TechDraw/TechDrawGlobal.h>
 
 
 class QComboBox;
 class QPointF;
 class QRectF;
 
-namespace App {
-class DocumentObject;
-}
-
 namespace Part {
 class Feature;
 }
@@ -85,6 +83,9 @@ class TechDrawGuiExport DrawGuiUtil {
     static Base::Vector3d fromSceneCoords(const Base::Vector3d& sceneCoord, bool invert = true);
     static Base::Vector3d toSceneCoords(const Base::Vector3d& pageCoord, bool invert = true);
     static Base::Vector3d toGuiPoint(TechDraw::DrawView* obj, const Base::Vector3d& toConvert);
+
+    static bool findObjectInSelection(const std::vector<Gui::SelectionObject>& selection,
+                                      const App::DocumentObject& targetObject);
 };
 
 } //end namespace TechDrawGui

src/Mod/TechDraw/Gui/QGIPrimPath.cpp

@@ -39,10 +39,12 @@
 #include "QGIPrimPath.h"
 #include "PreferencesGui.h"
 #include "QGIView.h"
+#include "DrawGuiUtil.h"
 
 
 using namespace TechDrawGui;
 using namespace TechDraw;
+using DGU = DrawGuiUtil;
 
 QGIPrimPath::QGIPrimPath():
     m_width(0),
@@ -251,9 +253,9 @@ void QGIPrimPath::mousePressEvent(QGraphicsSceneMouseEvent *event)
         auto parent = dynamic_cast<QGIView *>(parentItem());
         if (parent) {
             std::vector<Gui::SelectionObject> selection = Gui::Selection().getSelectionEx();
-            if (selection.size() == 1
-                && selection.front().getObject() == parent->getViewObject()) {
-
+            if (DGU::findObjectInSelection(selection, *(parent->getViewObject()))) {
+                // if our parent is already in the selection, then allow addition
+                // primitives to be selected.
                 multiselectActivated = true;
                 event->setModifiers(originalModifiers | Qt::ControlModifier);
             }