[TD]Transition to on demand page updates ph1

src/Mod/TechDraw/App/DrawProjGroup.h

@@ -127,6 +127,11 @@ public:
     void dumpISO(char * title);
     std::vector<DrawProjGroupItem*> getViewsAsDPGI();
 
+    void recomputeChildren(void);
+    void updateChildrenScale(void);
+    void autoPositionChildren(void);
+    void updateChildrenEnforce(void);
+
 protected:
     void onChanged(const App::Property* prop) override;
 
@@ -158,7 +163,7 @@ protected:
 
     /// Returns pointer to our page, or NULL if it couldn't be located
     TechDraw::DrawPage * getPage(void) const;
-    void updateChildren(void);
+
     void updateChildrenSource(void);
     void updateChildrenLock(void);
     int getViewIndex(const char *viewTypeCStr) const;