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Provide tooltip for Title and each Axis (Vaadin Charts 2)
Originally by basil.bourque
In Vaadin Charts 2, the tooltip balloons on each DataSeriesItem (data points on chart line) work well.
Suggestion: Display a similar tooltip balloon on the Title and on each Axis.
Motivation: I show many charts on a layout, so I need make the most of my limited pixels. I disable the axis labels to save space. I still have the numbering scale on each axis. It would nice if, when the user hovered over that numbering scale of the axis, I could provide a tooltip with explanatory info such as "Total Net Generation, in Megawatts".
So too it would nice to have a tooltip for the title. To keep the interface clean and simple, I keep each chart’s title short and sweet. But for new workers, it would be nice to provide a fuller explanation of the chart while they are learning my app.
Imported from https://dev.vaadin.com/ issue #16518