Add an integration test to validate pick mode crash (#2935)

* add an integration test to validate pick mode crash

Signed-off-by: hultonha <hultonha@amazon.co.uk>

* update to test after review feedback

Signed-off-by: hultonha <hultonha@amazon.co.uk>

Code/Framework/AzToolsFramework/AzToolsFramework/UnitTest/AzToolsFrameworkTestHelpers.cpp

@@ -65,6 +65,35 @@ namespace UnitTest
         }
     }
 
+    bool FocusInteractionWidget::event(QEvent* event)
+    {
+        using AzToolsFramework::EditorInteractionSystemViewportSelectionRequestBus;
+
+        auto eventType = event->type();
+
+        switch (eventType)
+        {
+        case QEvent::MouseButtonPress:
+            EditorInteractionSystemViewportSelectionRequestBus::Event(
+                AzToolsFramework::GetEntityContextId(), &EditorInteractionSystemViewportSelectionRequestBus::Events::SetDefaultHandler);
+            return true;
+        case QEvent::FocusIn:
+        case QEvent::FocusOut:
+            {
+                bool handled = false;
+                AzToolsFramework::ViewportInteraction::MouseInteraction mouseInteraction;
+                EditorInteractionSystemViewportSelectionRequestBus::EventResult(
+                    handled, AzToolsFramework::GetEntityContextId(),
+                    &EditorInteractionSystemViewportSelectionRequestBus::Events::InternalHandleMouseViewportInteraction,
+                    AzToolsFramework::ViewportInteraction::MouseInteractionEvent(
+                        mouseInteraction, AzToolsFramework::ViewportInteraction::MouseEvent::Down));
+                return handled;
+            }
+        }
+
+        return QWidget::event(event);
+    }
+
     void TestEditorActions::Connect()
     {
         using AzToolsFramework::GetEntityContextId;

Code/Framework/AzToolsFramework/AzToolsFramework/UnitTest/AzToolsFrameworkTestHelpers.h

@@ -8,6 +8,7 @@
 
 #pragma once
 
+#if !defined(Q_MOC_RUN)
 #include <AzCore/Asset/AssetCommon.h>
 #include <AzCore/Component/ComponentApplicationBus.h>
 #include <AzCore/Slice/SliceAsset.h>
@@ -31,6 +32,7 @@
 #include <AzToolsFramework/ViewportSelection/EditorInteractionSystemViewportSelectionRequestBus.h>
 #include <AzToolsFramework/SourceControl/PerforceConnection.h>
 #include <AzToolsFramework/UnitTest/ToolsTestApplication.h>
+#endif // !defined(Q_MOC_RUN)
 
 #include <ostream>
 
@@ -40,7 +42,7 @@ AZ_POP_DISABLE_WARNING
 
 #define AUTO_RESULT_IF_SETTING_TRUE(_settingName, _result)  \
     {                                                       \
-        bool settingValue = true;                          \
+        bool settingValue = true;                           \
         if (auto* registry = AZ::SettingsRegistry::Get())   \
         {                                                   \
             registry->Get(settingValue, _settingName);      \
@@ -51,23 +53,16 @@ AZ_POP_DISABLE_WARNING
             EXPECT_TRUE(_result);                           \
             return;                                         \
         }                                                   \
-    }  
-
-namespace AZ
-{
-    class Entity;
-    class EntityId;
-
-} // namespace AZ
+    }
 
 namespace UnitTest
 {
     constexpr AZStd::string_view prefabSystemSetting = "/Amazon/Preferences/EnablePrefabSystem";
 
     /// Test widget to store QActions generated by EditorTransformComponentSelection.
-    class TestWidget
-        : public QWidget
+    class TestWidget : public QWidget
     {
+        Q_OBJECT
     public:
         TestWidget()
             : QWidget()
@@ -79,6 +74,15 @@ namespace UnitTest
         bool eventFilter(QObject* watched, QEvent* event) override;
     };
 
+    /// Widget used to trigger a viewport interaction event while a focus change is happening.
+    class FocusInteractionWidget : public QWidget
+    {
+        Q_OBJECT
+    public:
+        FocusInteractionWidget(QWidget* parent = nullptr) : QWidget(parent) {}
+        bool event(QEvent* event) override;
+    };
+
     /// Stores actions registered for either normal mode (regular viewport) editing and
     /// component mode editing.
     class TestEditorActions