QmlJSEditor: avoid jumping cursor while editing

Writing a property made the cursor jumped to the beginning. Now we
only set the cursor if the textedit has not the focus and no code
completion open.

Change-Id: I7e5d41d5f7f9d75ebc90506d276ccaeb193c64b2
Task-number: QTCREATORBUG-15680
Task-number: QTCREATORBUG-17413
Reviewed-by: Marco Benelli <marco.benelli@qt.io>
Reviewed-by: Robert Loehning <robert.loehning@qt.io>

src/plugins/qmljseditor/qmljseditor.h

@@ -67,6 +67,7 @@ public:
 
     QModelIndex outlineModelIndex();
     void updateOutlineIndexNow();
+    bool isOutlineCursorChangesBlocked();
 
     TextEditor::AssistInterface *createAssistInterface(TextEditor::AssistKind assistKind,
                            TextEditor::AssistReason reason) const override;
@@ -121,6 +122,7 @@ private:
     QTimer m_contextPaneTimer;
     QComboBox *m_outlineCombo;
     QModelIndex m_outlineModelIndex;
+    bool m_blockOutLineCursorChanges = false;
     QmlJS::ModelManagerInterface *m_modelManager = nullptr;
 
     QmlJS::IContextPane *m_contextPane = nullptr;