Create a new text style with the specified font, foreground
and background.
@param font the font of the style, <code>null</code> if none
@param foreground the foreground color of the style, <code>null</code> if none
@param background the background color of the style, <code>null</code> if none
Create a new text style with the specified font, foreground and background.
@param font the font of the style, <code>null</code> if none @param foreground the foreground color of the style, <code>null</code> if none @param background the background color of the style, <code>null</code> if none