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The color to use when drawing the icon.
Defaults to the current IconTheme color, if any. If there is no IconTheme, then it defaults to white if the theme is dark and black if the theme is light. See Theme to set the current theme and ThemeData.brightness for setting the current theme's brightness.
The given color will be adjusted by the opacity of the current IconTheme, if any.
Typically, a material design color will be used, as follows:
new Icon(
icon: Icons.widgets,
color: Colors.blue[400],
),