[PD] allow to move sweep sections

Now that we have the feature that sweeps can have vertices as end or begin of a sweep, there is the need for the feature to move sections. For example vertices may only be the last section.

src/Mod/PartDesign/Gui/TaskPipeParameters.cpp

@@ -938,6 +938,9 @@ TaskPipeScaling::TaskPipeScaling(ViewProviderPipe* PipeView, bool /*newObj*/, QW
     ui->listWidgetReferences->setContextMenuPolicy(Qt::ActionsContextMenu);
     connect(remove, SIGNAL(triggered()), this, SLOT(onDeleteSection()));
 
+    connect(ui->listWidgetReferences->model(),
+        SIGNAL(rowsMoved(QModelIndex, int, int, QModelIndex, int)), this, SLOT(indexesMoved()));
+
     this->groupLayout()->addWidget(proxy);
 
     PartDesign::Pipe* pipe = static_cast<PartDesign::Pipe*>(PipeView->getObject());
@@ -964,6 +967,27 @@ TaskPipeScaling::~TaskPipeScaling()
     }
 }
 
+void TaskPipeScaling::indexesMoved()
+{
+    QAbstractItemModel* model = qobject_cast<QAbstractItemModel*>(sender());
+    if (!model)
+        return;
+
+    PartDesign::Pipe* pipe = static_cast<PartDesign::Pipe*>(vp->getObject());
+    auto originals = pipe->Sections.getSubListValues();
+
+    QByteArray name;
+    int rows = model->rowCount();
+    for (int i = 0; i < rows; i++) {
+        QModelIndex index = model->index(i, 0);
+        originals[i] = index.data(Qt::UserRole).value<App::PropertyLinkSubList::SubSet>();
+    }
+
+    pipe->Sections.setSubListValues(originals);
+    recomputeFeature();
+    updateUI(ui->stackedWidget->currentIndex());
+}
+
 void TaskPipeScaling::clearButtons(const selectionModes notThis)
 {
     // TODO: Clear buttons in the other pipe taskboxes as well

src/Mod/PartDesign/Gui/TaskPipeParameters.h

@@ -145,6 +145,7 @@ private Q_SLOTS:
     void onButtonRefRemove(bool checked);
     void updateUI(int idx);
     void onDeleteSection();
+    void indexesMoved();
 
 protected:
     enum selectionModes { none, refAdd, refRemove };

src/Mod/PartDesign/Gui/TaskPipeScaling.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>353</width>
-    <height>407</height>
+    <width>262</width>
+    <height>270</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -97,7 +97,14 @@
         </layout>
        </item>
        <item>
-        <widget class="QListWidget" name="listWidgetReferences"/>
+        <widget class="QListWidget" name="listWidgetReferences">
+         <property name="toolTip">
+          <string>List can be reordered by dragging</string>
+         </property>
+         <property name="dragDropMode">
+          <enum>QAbstractItemView::InternalMove</enum>
+         </property>
+        </widget>
        </item>
       </layout>
      </widget>