message: fixed python editor on 4.12
diff: @@ -144,7 +144,27 @@ FBasicPythonEditorMode::FBasicPythonEditorMode(TSharedPtr<class FPythonProjectEd
  ->SetHideTabWell(true)
  ->AddTab(InPythonEditor->GetToolbarTabId(), ETabState::OpenedTab)
  )
  + ->Split
  + (
  + FTabManager::NewSplitter()
  + ->SetSizeCoefficient(0.9f)
  + ->SetOrientation(Orient_Horizontal)
  + ->Split
  + (
  + FTabManager::NewStack()
  + ->SetSizeCoefficient(0.2)
  + ->SetHideTabWell(true)
  + ->AddTab(PythonEditorTabs::ProjectViewID, ETabState::OpenedTab)
  + )
  + ->Split
  + (
  + FTabManager::NewStack()
  + ->SetSizeCoefficient(0.8)
  + ->SetHideTabWell(false)
  + ->AddTab(PythonEditorTabs::PythonViewID, ETabState::ClosedTab)
  + )
  + )
  );
  InPythonEditor->GetToolbarBuilder()->AddEditorToolbar(ToolbarExtender);
  