Add delay for tooltips

[alielbashir]

This adds a delay to the tooltips in the config editor fixes #289

I have some questions regarding this since it's not mentioned in the issue itself:

• In case Tooltip widgets would be used in the future in other pages, should this be moved up the widget tree?
• IconButton widgets have tooltips but they don't have a waitDuration parameter. Would this difference in delays be detrimental enough to UX to warrant not making this change?

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[jpnurmi]

Thanks, this is a great improvement! I think we could make the delay even slightly longer. For comparison, GTK defaults to 500ms.

• In case Tooltip widgets would be used in the future in other pages, should this be moved up the widget tree?
• IconButton widgets have tooltips but they don't have a waitDuration parameter. Would this difference in delays be detrimental enough to UX to warrant not making this change?

I'd probably specify the wait duration in the global theme data because I doubt we want those immediately appearing tooltips anywhere in the app. That way, it should apply to icon buttons, too. :)

[alielbashir]

You're right, with this change tooltips in icon buttons also inherit the TooltipThemeData, and with it the specified delay. I also set the delay to 500ms like you recommended

[jpnurmi]

@Feichtmeier, any thoughts on specifying a default wait duration for tooltips in yaru.dart?

[Feichtmeier]

Sure can do