App: fix Link document restore

This fixes issue #0004224

src/App/Application.cpp

@@ -703,6 +703,9 @@ std::vector<Document*> Application::openDocuments(const std::vector<std::string>
     _pendingDocMap.clear();
 
     Base::SequencerLauncher seq("Postprocessing...", newDocs.size());
+    for (auto &v : newDocs) 
+        PropertyXLink::restoreDocument(*v.first);
+
     for (auto &v : newDocs) {
         FC_TIME_INIT(t1);
         v.first->afterRestore(true);

src/App/PropertyLinks.cpp

@@ -2641,6 +2641,13 @@ public:
         }
     }
 
+    static void restoreDocument(const App::Document &doc) {
+        auto it = _DocInfoMap.find(getFullPath(doc.FileName.getValue()));
+        if(it==_DocInfoMap.end())
+            return;
+        it->second->slotFinishRestoreDocument(doc);
+    }
+
     void slotFinishRestoreDocument(const App::Document &doc) {
         if(pcDoc) return;
         QString fullpath(getFullPath());
@@ -3423,6 +3430,10 @@ bool PropertyXLink::hasXLink(
     return ret;
 }
 
+void PropertyXLink::restoreDocument(const App::Document &doc) {
+    DocInfo::restoreDocument(doc);
+}
+
 std::map<App::Document*,std::set<App::Document*> > 
 PropertyXLink::getDocumentOutList(App::Document *doc) {
     std::map<App::Document*,std::set<App::Document*> > ret;

src/App/PropertyLinks.h

@@ -1107,6 +1107,7 @@ public:
     static bool hasXLink(const std::vector<App::DocumentObject*> &objs, std::vector<App::Document*> *unsaved=0);
     static std::map<App::Document*,std::set<App::Document*> > getDocumentOutList(App::Document *doc=0);
     static std::map<App::Document*,std::set<App::Document*> > getDocumentInList(App::Document *doc=0);
+    static void restoreDocument(const App::Document &doc);
 
     virtual void updateElementReference(
             DocumentObject *feature,bool reverse=false, bool notify=false) override;