merge method
Implementation
TooltipThemeData merge(TooltipThemeData? style) {
if (style == null) return this;
return TooltipThemeData(
decoration: style.decoration ?? decoration,
height: style.height ?? height,
margin: style.margin ?? margin,
padding: style.padding ?? padding,
preferBelow: style.preferBelow ?? preferBelow,
showDuration: style.showDuration ?? showDuration,
textStyle: style.textStyle ?? textStyle,
verticalOffset: style.verticalOffset ?? verticalOffset,
waitDuration: style.waitDuration ?? waitDuration,
);
}