In stack chart show all stacked values on tooltip about elastic-charts HOT 3 CLOSED

@AlonaNadler great, I will close this in favour of #80 that will track this feature

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@AlonaNadler do you see this as an enforced practice in code or something that can be selected by the user/developer?
We will add the crosshair interaction that will work exactly as you describe: for each x value it will shows the Y values of all the series in a single tooltip.
I've some concerns on enforcing and that's the reason we want to let the user/dev choose:

• it depends on the data context: you may be don't want to compare the two values and only visualize single tooltips
• you may have 10 stacked elements creating a very crowded tooltip for crosshair (specially when you are splitting your chart)
• what happens when we just cluster our bars instead of stack them? this doesn't mean that we don't want to compare the clustered bars together.

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• what happens when we just cluster our bars instead of stack them? this doesn't mean that we don't want to compare the clustered bars together.

The existing behavior makes sense for cluster bars, I don't think you need to change anything there.
My issue is only for stacked, It will help to see in the tooltip the line users hovering on in the first line and then the rest, you can limit it or make it scrollable

When you are using stack, you often want to compare values so it makes sense, if users don't want it they can get used to the fact the line they are hovering on is always first and ignore the rest.

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