_gtkWidgetBackgroundSet defines the background color of a
Widgets object.
Some Widgets object can not directly change their background color.
In this case, try to add an Eventbox object
before.
Prototype : fun [* ObjColor I] *
* : a Widgets object.
ObjColor : a new background color.
I : a flag to define the Widgets state which this change must occur :
STATE_NORMAL : normal
STATE_ACTIVE : the Widgets object is active
STATE_PRELIGHT : the Widgets object has a mouse pointer over it.
STATE_SELECTED : the Widgets object is selected.
STATE_INSENSITIVE : the Widgets object is in a insensitive state (disabled).
STATE_INCONSISTENT : the Widgets object is in a inconsistent state (with GTK3 only).
STATE_FOCUSED : the Widgets object has the keyboard focus. (with GTK3 only).
Return * : the same Widgets object
or nil if an error occurs.
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