Fix editor orbit camera (#1683)

* Add a way for the EditorViewportWidget to inform the legacy orbit camera of the calculated orbit distance.

Signed-off-by: rgba16f <82187279+rgba16f@users.noreply.github.com>

Code/Editor/LegacyViewportCameraController.cpp

@@ -26,6 +26,12 @@ namespace SandboxEditor
 LegacyViewportCameraControllerInstance::LegacyViewportCameraControllerInstance(AzFramework::ViewportId viewportId, LegacyViewportCameraController* controller)
     : AzFramework::MultiViewportControllerInstanceInterface<LegacyViewportCameraController>(viewportId, controller)
 {
+    OrbitCameraControlsBus::Handler::BusConnect(viewportId);
+}
+
+LegacyViewportCameraControllerInstance::~LegacyViewportCameraControllerInstance()
+{
+    OrbitCameraControlsBus::Handler::BusDisconnect();
 }
 
 bool LegacyViewportCameraControllerInstance::JustAltHeld() const
@@ -59,6 +65,12 @@ bool LegacyViewportCameraControllerInstance::InvertPan() const
     return JustAltHeld();
 }
 
+void LegacyViewportCameraControllerInstance::SetOrbitDistance(float orbitDistance)
+{
+    m_orbitDistance = orbitDistance;
+}
+
+
 AZ::RPI::ViewportContextPtr LegacyViewportCameraControllerInstance::GetViewportContext()
 {
     // This could be cached, if needed