Remove section line from DVP on delete of DVS

src/Mod/TechDraw/App/DrawViewSection.cpp

@@ -506,6 +506,11 @@ Base::Vector3d DrawViewSection::getSectionVector (const std::string sectionName)
     return adjResult;
 }
 
+void DrawViewSection::unsetupObject()
+{
+    getBaseDVP()->touch();
+}
+
 TechDraw::DrawViewPart* DrawViewSection::getBaseDVP()
 {
     TechDraw::DrawViewPart* baseDVP = nullptr;

src/Mod/TechDraw/App/DrawViewSection.h

@@ -89,6 +89,7 @@ public:
     Base::Vector3d getSectionVector (const std::string sectionName);
     TechDraw::DrawViewPart* getBaseDVP();
     TechDraw::DrawProjGroupItem* getBaseDPGI();
+    virtual void unsetupObject();
 
     static const char* SectionDirEnums[];
 

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -323,7 +323,10 @@ void QGIViewPart::updateView(bool update)
         viewPart->SmoothHidden.isTouched()    ||
         viewPart->SeamHidden.isTouched()      ||
         viewPart->IsoHidden.isTouched()       ||
-        viewPart->IsoCount.isTouched()  ) {
+        viewPart->IsoCount.isTouched()        ||
+        viewPart->ShowSectionLine.isTouched() ||
+        viewPart->HorizCenterLine.isTouched() ||
+        viewPart->VertCenterLine.isTouched() ) {
         draw();
     } else if (update ||
               viewPart->LineWidth.isTouched() ||