QmlDesigner: Keep possible imports updated

QmlJS resolves available libraries at its own pace on the background,
which means all possible imports are not necessarily known at the time
the model is attached.
Listen to QmlJS::ModelManagerInterface::libraryInfoUpdated to trigger
reload of document when available libraries change to keep
possible imports list up to date.

Change-Id: Id605a6ee1fe2c43735bb30c9446d2a31ef52fe99
Fixes: QDS-1592
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

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

@@ -189,6 +189,7 @@ protected: // functions
 private: //variables
     ModelNode nodeAtTextCursorPositionHelper(const ModelNode &root, int cursorPosition) const;
     void setupCanonicalHashes() const;
+    void handleLibraryInfoUpdate();
 
     TextModifier *m_textModifier = nullptr;
     int transactionLevel = 0;
@@ -209,6 +210,7 @@ private: //variables
     std::function<void(bool)> m_setWidgetStatusCallback;
     bool m_hasIncompleteTypeInformation = false;
     bool m_restoringAuxData = false;
+    bool m_modelAttachPending = false;
 
     mutable QHash<int, ModelNode> m_canonicalIntModelNode;
     mutable QHash<ModelNode, int> m_canonicalModelNodeInt;

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

@@ -70,7 +70,12 @@ RewriterView::RewriterView(DifferenceHandling differenceHandling, QObject *paren
         m_textToModelMerger(new Internal::TextToModelMerger(this))
 {
     m_amendTimer.setSingleShot(true);
+    m_amendTimer.setInterval(400);
     connect(&m_amendTimer, &QTimer::timeout, this, &RewriterView::amendQmlText);
+
+    QmlJS::ModelManagerInterface *modelManager = QmlJS::ModelManagerInterface::instance();
+    connect(modelManager, &QmlJS::ModelManagerInterface::libraryInfoUpdated,
+            this, &RewriterView::handleLibraryInfoUpdate, Qt::QueuedConnection);
 }
 
 RewriterView::~RewriterView() = default;
@@ -87,6 +92,8 @@ Internal::TextToModelMerger *RewriterView::textToModelMerger() const
 
 void RewriterView::modelAttached(Model *model)
 {
+    m_modelAttachPending = false;
+
     if (model && model->textModifier())
         setTextModifier(model->textModifier());
 
@@ -100,10 +107,12 @@ void RewriterView::modelAttached(Model *model)
     if (!(m_errors.isEmpty() && m_warnings.isEmpty()))
         notifyErrorsAndWarnings(m_errors);
 
-    if (hasIncompleteTypeInformation())
+    if (hasIncompleteTypeInformation()) {
+        m_modelAttachPending = true;
         QTimer::singleShot(1000, this, [this, model](){
             modelAttached(model);
         });
+    }
 }
 
 void RewriterView::modelAboutToBeDetached(Model * /*model*/)
@@ -796,6 +805,13 @@ void RewriterView::setupCanonicalHashes() const
     }
 }
 
+void RewriterView::handleLibraryInfoUpdate()
+{
+    // Trigger dummy amend to reload document when library info changes
+    if (isAttached() && !m_modelAttachPending)
+        m_amendTimer.start();
+}
+
 ModelNode RewriterView::nodeAtTextCursorPosition(int cursorPosition) const
 {
     return nodeAtTextCursorPositionHelper(rootModelNode(), cursorPosition);
@@ -995,7 +1011,7 @@ void RewriterView::qmlTextChanged()
                 auto &viewManager = QmlDesignerPlugin::instance()->viewManager();
                 if (viewManager.usesRewriterView(this)) {
                     QmlDesignerPlugin::instance()->viewManager().disableWidgets();
-                    m_amendTimer.start(400);
+                    m_amendTimer.start();
                 }
 #else
                 /*Keep test synchronous*/