Efl.Gfx.Entity is not used in Efl.Ui.Win.Part.
The interface can be added when it is needed later.
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Looks something wrong about color,
there is still an implemenation of _efl_ui_win_part_efl_gfx_color_color_set()/get(), _efl_ui_wi_efl_ui_win_part_efl_file_file_set()/get()
Guess they could be used or remove the bodies additionally.