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* `Stroke_color`, `Current_stroke_color` for line drawings.
* `Icon_color` affects the color of the little mode icon on the top right of
a drawing.
* `Current_name_background_color` manages the color when naming points using
`ctrl+n`.
* `Focus_stroke_color` affects the color of a point or line when you hover
over it.
* `Help_color` and `Help_background_color` affect the color of online help
within line drawings.