void gtk_entry_get_icon_area ( GtkEntry* entry, GtkEntryIconPosition icon_pos, GdkRectangle* icon_area )
Gets the area where entry’s icon at
icon_pos is drawn.
This function is useful when drawing something to the entry in a draw callback.
If the entry is not realized or has no icon at the given
icon_area is filled with zeros. Otherwise,
icon_area will be filled with the icon’s allocation,