refactor: Uses single QML engine for all QML code (#323)

* refactor: Uses single QML engine for all QML code

* fix: Adds missing `QPointer` include

* Parents QML engine instance to plugin instance.

---------

Co-authored-by: Ivan Lebedev <ilebedev@flightpath3d.com>
Co-authored-by: Ivan Lebedev <ilebedev1988@gmail.com>

chat/ChatOutputPane.cpp

@@ -7,9 +7,9 @@
 
 namespace QodeAssist::Chat {
 
-ChatOutputPane::ChatOutputPane(QObject *parent)
+ChatOutputPane::ChatOutputPane(QQmlEngine* engine, QObject *parent)
     : Core::IOutputPane(parent)
-    , m_chatWidget(new ChatWidget)
+    , m_chatWidget{new ChatWidget{engine}}
 {
     setId("QodeAssistChat");
     setDisplayName(Tr::tr("QodeAssist Chat"));

chat/ChatOutputPane.h

@@ -13,7 +13,7 @@ class ChatOutputPane : public Core::IOutputPane
     Q_OBJECT
 
 public:
-    explicit ChatOutputPane(QObject *parent = nullptr);
+    explicit ChatOutputPane(QQmlEngine* engine, QObject *parent = nullptr);
     ~ChatOutputPane() override;
 
     QWidget *outputWidget(QWidget *parent) override;

chat/NavigationPanel.cpp

@@ -7,7 +7,8 @@
 
 namespace QodeAssist::Chat {
 
-NavigationPanel::NavigationPanel()
+NavigationPanel::NavigationPanel(QQmlEngine* engine)
+    : m_engine{engine}
 {
     setDisplayName(tr("QodeAssist Chat"));
     setPriority(500);
@@ -19,10 +20,7 @@ NavigationPanel::~NavigationPanel() {}
 
 Core::NavigationView NavigationPanel::createWidget()
 {
-    Core::NavigationView view;
-    view.widget = new ChatWidget;
-
-    return view;
+    return {.widget = new ChatWidget{m_engine}};
 }
 
 } // namespace QodeAssist::Chat

chat/NavigationPanel.hpp

@@ -5,6 +5,9 @@
 
 #include <coreplugin/inavigationwidgetfactory.h>
 #include <QObject>
+#include <QPointer>
+
+class QQmlEngine;
 
 namespace QodeAssist::Chat {
 
@@ -12,10 +15,13 @@ class NavigationPanel : public Core::INavigationWidgetFactory
 {
     Q_OBJECT
 public:
-    explicit NavigationPanel();
+    explicit NavigationPanel(QQmlEngine* engine);
     ~NavigationPanel();
 
     Core::NavigationView createWidget() override;
+
+private:
+    QPointer<QQmlEngine> m_engine;
 };
 
 } // namespace QodeAssist::Chat