QmlDesigner: Allow to disable possible imports

Getting all possible imports can be slow and
is not required in every context.

Change-Id: I75c50e0f6600dfa8fca7dfec26382783b084bdb9
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>

src/plugins/qmldesigner/designercore/include/rewriterview.h

@@ -167,6 +167,9 @@ public:
 
     void resetPossibleImports();
 
+    bool possibleImportsEnabled() const;
+    void setPossibleImportsEnabled(bool b);
+
 signals:
     void modelInterfaceProjectUpdated();
 
@@ -212,6 +215,7 @@ private: //variables
     bool m_restoringAuxData = false;
     bool m_modelAttachPending = false;
     bool m_allowComponentRoot = false;
+    bool m_possibleImportsEnabled = true;
 
     mutable QHash<int, ModelNode> m_canonicalIntModelNode;
     mutable QHash<ModelNode, int> m_canonicalModelNodeInt;

src/plugins/qmldesigner/designercore/model/rewriterview.cpp

@@ -693,6 +693,16 @@ void RewriterView::resetPossibleImports()
     m_textToModelMerger->clearPossibleImportKeys();
 }
 
+bool RewriterView::possibleImportsEnabled() const
+{
+    return m_possibleImportsEnabled;
+}
+
+void RewriterView::setPossibleImportsEnabled(bool b)
+{
+    m_possibleImportsEnabled = b;
+}
+
 Internal::ModelNodePositionStorage *RewriterView::positionStorage() const
 {
     return m_positionStorage.data();

src/plugins/qmldesigner/designercore/model/texttomodelmerger.cpp

@@ -984,6 +984,9 @@ static QList<QmlDesigner::Import> generatePossibleLibraryImports(const QHash<QSt
 
 void TextToModelMerger::setupPossibleImports(const QmlJS::Snapshot &snapshot, const QmlJS::ViewerContext &viewContext)
 {
+    if (!m_rewriterView->possibleImportsEnabled())
+        return;
+
     static QUrl lastProjectUrl;
     auto &externalDependencies = m_rewriterView->externalDependencies();
     auto projectUrl = externalDependencies.projectUrl();