ModelEditor: Reload documents

Task-number: QTCREATORBUG-20612
Change-Id: Ie4a89f17e9f062ab273b58f19b8c5d6193cedacc
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/modeleditor/modeldocument.cpp

@@ -127,8 +127,17 @@ bool ModelDocument::reload(QString *errorString, Core::IDocument::ReloadFlag fla
         emit changed();
         return true;
     }
-    *errorString = tr("Cannot reload model file.");
+    try {
-    return false;
+        d->documentController->loadProject(filePath().toString());
+    } catch (const qmt::FileNotFoundException &ex) {
+        *errorString = ex.errorMessage();
+        return false;
+    } catch (const qmt::Exception &ex) {
+        *errorString = tr("Could not open \"%1\" for reading: %2.").arg(filePath().toString()).arg(ex.errorMessage());
+        return false;
+    }
+    emit contentSet();
+    return true;
 }
 
 ExtDocumentController *ModelDocument::documentController() const

src/plugins/modeleditor/modeleditor.cpp

@@ -369,16 +369,16 @@ void ModelEditor::init(QWidget *parent)
 
 void ModelEditor::initDocument()
 {
+    if (d->diagramsViewManager)
+        return;
+
     initToolbars();
 
     ExtDocumentController *documentController = d->document->documentController();
 
     d->diagramView->setPxNodeController(documentController->pxNodeController());
 
-    QMT_CHECK(!d->diagramsViewManager);
     d->diagramsViewManager = new DiagramsViewManager(this);
-    //connect(diagramsViewManager, &DiagramsViewManager::someDiagramOpened,
-    //        documentController->diagramsManager(), &qmt::DiagramsManager::someDiagramOpened);
     connect(d->diagramsViewManager, &DiagramsViewManager::openNewDiagram,
             this, &ModelEditor::showDiagram);
     connect(d->diagramsViewManager, &DiagramsViewManager::closeOpenDiagram,