[TD]fix Front lock icon in DPG

src/Mod/TechDraw/App/DrawProjGroupItem.cpp

@@ -102,6 +102,7 @@ void DrawProjGroupItem::onChanged(const App::Property *prop)
 bool DrawProjGroupItem::isLocked(void) const
 {
     bool isLocked = DrawView::isLocked();
+
     if (isAnchor()) {                             //Anchor view is always locked to DPG
         return true;
     }
@@ -112,6 +113,24 @@ bool DrawProjGroupItem::isLocked(void) const
     return isLocked;
 }
 
+bool DrawProjGroupItem::showLock(void) const
+{
+    bool result = DrawView::showLock();
+    DrawProjGroup* parent = getPGroup();
+    bool parentLock = false;
+    if (parent != nullptr) {
+        parentLock = parent->LockPosition.getValue();
+    }
+
+    if (isAnchor() &&                         //don't show lock for Front if DPG is not locked
+        !parentLock) { 
+        result = false;
+    }   
+
+    return result;
+}
+
+
 App::DocumentObjectExecReturn *DrawProjGroupItem::execute(void)
 {
     if (DrawUtil::checkParallel(Direction.getValue(),

src/Mod/TechDraw/App/DrawProjGroupItem.h

@@ -84,6 +84,7 @@ public:
 protected:
     void onChanged(const App::Property* prop) override;
     virtual bool isLocked(void) const override;
+    virtual bool showLock(void) const override;
 
 private:
     static const char* TypeEnums[];

src/Mod/TechDraw/App/DrawView.cpp

@@ -153,6 +153,11 @@ bool DrawView::isLocked(void) const
     return LockPosition.getValue();
 }
 
+bool DrawView::showLock(void) const
+{
+    return true;
+}
+
 //override this for View inside a group (ex DPGI in DPG)
 void DrawView::handleXYLock(void) 
 {

src/Mod/TechDraw/App/DrawView.h

@@ -92,6 +92,7 @@ public:
     void requestPaint(void);
     virtual void handleXYLock(void);
     virtual bool isLocked(void) const;
+    virtual bool showLock(void) const;
 
     std::vector<TechDraw::DrawLeaderLine*> getLeaders(void) const;
 

src/Mod/TechDraw/Gui/QGIView.cpp

@@ -502,7 +502,8 @@ void QGIView::drawBorder()
 
     double lockX = frameArea.left();
     double lockY = frameArea.bottom() - m_lockHeight;
-    if (feat->isLocked()) {
+    if (feat->isLocked() &&
+        feat->showLock()) {
         m_lock->setZValue(ZVALUE::LOCK);
         m_lock->setPos(lockX,lockY);
         m_lock->show();