Fix editor controls working in game mode

-Implements ResetInputChannels for ViewportController API and SetEnabled for ViewportControllerList
-Disables all viewport controllers while in game mode

Code/Sandbox/Editor/EditorViewportWidget.cpp

@@ -679,6 +679,11 @@ void EditorViewportWidget::OnEditorNotifyEvent(EEditorNotifyEvent event)
             }
             SetCurrentCursor(STD_CURSOR_GAME);
         }
+
+        if (m_renderViewport)
+        {
+            m_renderViewport->GetControllerList()->SetEnabled(false);
+        }
     }
     break;
 
@@ -697,6 +702,11 @@ void EditorViewportWidget::OnEditorNotifyEvent(EEditorNotifyEvent event)
 
             RestoreViewportAfterGameMode();
         }
+
+        if (m_renderViewport)
+        {
+            m_renderViewport->GetControllerList()->SetEnabled(true);
+        }
         break;
 
     case eNotify_OnCloseScene:

Code/Sandbox/Editor/LegacyViewportCameraController.cpp

@@ -408,6 +408,13 @@ bool LegacyViewportCameraControllerInstance::HandleInputChannelEvent(const AzFra
         }
     }
 
+    UpdateCursorCapture(shouldCaptureCursor);
+
+    return shouldConsumeEvent;
+}
+
+void LegacyViewportCameraControllerInstance::UpdateCursorCapture(bool shouldCaptureCursor)
+{
     if (m_capturingCursor != shouldCaptureCursor)
     {
         if (shouldCaptureCursor)
@@ -427,8 +434,14 @@ bool LegacyViewportCameraControllerInstance::HandleInputChannelEvent(const AzFra
 
         m_capturingCursor = shouldCaptureCursor;
     }
+}
 
-    return shouldConsumeEvent;
+void LegacyViewportCameraControllerInstance::ResetInputChannels()
+{
+    m_modifiers = 0;
+    m_pressedKeys.clear();
+    UpdateCursorCapture(false);
+    m_inRotateMode = m_inMoveMode = m_inOrbitMode = m_inZoomMode = false;
 }
 
 void LegacyViewportCameraControllerInstance::UpdateViewport(const AzFramework::ViewportControllerUpdateEvent& event)

Code/Sandbox/Editor/LegacyViewportCameraController.h

@@ -35,6 +35,7 @@ namespace SandboxEditor
         explicit LegacyViewportCameraControllerInstance(AzFramework::ViewportId viewport);
 
         bool HandleInputChannelEvent(const AzFramework::ViewportControllerInputEvent& event) override;
+        void ResetInputChannels() override;
         void UpdateViewport(const AzFramework::ViewportControllerUpdateEvent& event) override;
 
     private:
@@ -53,6 +54,7 @@ namespace SandboxEditor
         bool HandleMouseMove(const AzFramework::ScreenPoint& currentMousePos, const AzFramework::ScreenPoint& previousMousePos);
         bool HandleMouseWheel(float zDelta);
         bool IsKeyDown(Qt::Key key) const;
+        void UpdateCursorCapture(bool shouldCaptureCursor);
 
         bool m_inRotateMode = false;
         bool m_inMoveMode = false;

Code/Sandbox/Editor/ViewportManipulatorController.cpp

@@ -202,6 +202,12 @@ bool ViewportManipulatorControllerInstance::HandleInputChannelEvent(const AzFram
     return interactionHandled;
 }
 
+void ViewportManipulatorControllerInstance::ResetInputChannels()
+{
+    m_pendingDoubleClicks.clear();
+    m_state = AzToolsFramework::ViewportInteraction::MouseInteraction();
+}
+
 void ViewportManipulatorControllerInstance::UpdateViewport(const AzFramework::ViewportControllerUpdateEvent& event)
 {
     m_curTime = event.m_time;

Code/Sandbox/Editor/ViewportManipulatorController.h

@@ -26,6 +26,7 @@ namespace SandboxEditor
         explicit ViewportManipulatorControllerInstance(AzFramework::ViewportId viewport);
 
         bool HandleInputChannelEvent(const AzFramework::ViewportControllerInputEvent& event) override;
+        void ResetInputChannels() override;
         void UpdateViewport(const AzFramework::ViewportControllerUpdateEvent& event) override;
 
     private: