Create a new strikethrough color attribute.
This attribute modifies the color of strikethrough lines. If not set, strikethrough lines will use the foreground color.
| red |
the red value (ranging from 0 to 65535) |
| green |
the green value |
| blue |
the blue value |
|
the newly allocated `PangoAttribute`, which should be freed with [method@Pango.Attribute.destroy] |