App/Gui: Fix auto checking 'Sync sub object' if property link editor

Related FreeCAD/FreeCAD#6672 case C

src/App/PropertyLinks.cpp

@@ -939,6 +939,11 @@ PropertyLinkSub::~PropertyLinkSub()
 #endif
 }
 
+void PropertyLinkSub::setSyncSubObject(bool enable)
+{
+    _Flags.set((std::size_t)LinkSyncSubObject, enable);
+}
+
 void PropertyLinkSub::setValue(App::DocumentObject * lValue,
         const std::vector<std::string> &SubList, std::vector<ShadowSub> &&shadows)
 {
@@ -1614,6 +1619,11 @@ PropertyLinkSubList::~PropertyLinkSubList()
 #endif
 }
 
+void PropertyLinkSubList::setSyncSubObject(bool enable)
+{
+    _Flags.set((std::size_t)LinkSyncSubObject, enable);
+}
+
 void PropertyLinkSubList::verifyObject(App::DocumentObject* obj, App::DocumentObject* parent)
 {
     if (obj) {
@@ -2968,6 +2978,7 @@ PropertyXLink::PropertyXLink(bool _allowPartial, PropertyLinkBase *parent)
 {
     setAllowPartial(_allowPartial);
     setAllowExternal(true);
+    setSyncSubObject(true);
     if(parent)
         setContainer(parent->getContainer());
 }
@@ -2976,6 +2987,11 @@ PropertyXLink::~PropertyXLink() {
     unlink();
 }
 
+void PropertyXLink::setSyncSubObject(bool enable)
+{
+    _Flags.set((std::size_t)LinkSyncSubObject, enable);
+}
+
 void PropertyXLink::unlink() {
     if(docInfo) {
         docInfo->remove(this);
@@ -3835,12 +3851,18 @@ TYPESYSTEM_SOURCE(App::PropertyXLinkSubList , App::PropertyLinkBase)
 PropertyXLinkSubList::PropertyXLinkSubList()
 {
     _pcScope = LinkScope::Global;
+    setSyncSubObject(true);
 }
 
 PropertyXLinkSubList::~PropertyXLinkSubList()
 {
 }
 
+void PropertyXLinkSubList::setSyncSubObject(bool enable)
+{
+    _Flags.set((std::size_t)LinkSyncSubObject, enable);
+}
+
 int PropertyXLinkSubList::getSize(void) const
 {
     return static_cast<int>(_Links.size());

src/App/PropertyLinks.h

@@ -537,6 +537,7 @@ public:
         LinkRestoring,
         LinkAllowPartial,
         LinkRestoreLabel,
+        LinkSyncSubObject, // used by DlgPropertyLink
     };
     inline bool testFlag(int flag) const {
         return _Flags.test((std::size_t)flag);
@@ -857,6 +858,7 @@ public:
 
     virtual bool adjustLink(const std::set<App::DocumentObject *> &inList) override;
 
+    void setSyncSubObject(bool enable);
 protected:
     App::DocumentObject*     _pcLinkSub;
     std::vector<std::string> _cSubList;
@@ -1003,6 +1005,8 @@ public:
 
     virtual bool adjustLink(const std::set<App::DocumentObject *> &inList) override;
 
+    void setSyncSubObject(bool enable);
+
 private:
     void verifyObject(App::DocumentObject *, App::DocumentObject *);
 
@@ -1139,6 +1143,8 @@ public:
 
     virtual bool upgrade(Base::XMLReader &reader, const char *typeName);
 
+    void setSyncSubObject(bool enable);
+
 protected:
     void unlink();
     void detach();
@@ -1292,6 +1298,8 @@ public:
     virtual void hasSetChildValue(Property &) override;
     virtual void aboutToSetChildValue(Property &) override;
 
+    void setSyncSubObject(bool enable);
+
 protected:
     std::list<PropertyXLinkSub> _Links;
 };

src/Gui/DlgPropertyLink.cpp

@@ -322,19 +322,23 @@ void DlgPropertyLink::init(const App::DocumentObjectT &prop, bool tryFilter) {
         docItems[d] = item;
     }
 
-    if(oldLinks.isEmpty())
-        return;
-
     if(allowSubObject) {
-        for(auto &link : oldLinks) {
-            auto sobj = link.getSubObject();
-            if(sobj && sobj!=link.getObject()) {
-                ui->checkSubObject->setChecked(true);
-                break;
+        if (propLink->testFlag(App::PropertyLinkBase::LinkSyncSubObject))
+            ui->checkSubObject->setChecked(true);
+        else {
+            for(auto &link : oldLinks) {
+                auto sobj = link.getSubObject();
+                if(sobj && sobj!=link.getObject()) {
+                    ui->checkSubObject->setChecked(true);
+                    break;
+                }
             }
         }
     }
 
+    if(oldLinks.isEmpty())
+        return;
+
     // Try to select items corresponding to the current links inside the
     // property
     ui->treeWidget->blockSignals(true);