Tabsheet scroller should scroll continuously while pressing the mouse button down

[vaadin-bot]

Originally by @jouni

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Currently the user is forced to click the mouse repeatedly to get to a the beginning or end of the tabs.

The scrolling should be continuos if the user keeps the mouse button pressed down, similarly to the year/month selection in PopupDateField.

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Imported from https://dev.vaadin.com/ issue #6997

[stale]

Hello there!

It looks like this issue hasn't progressed lately. There are so many issues that we just can't deal them all within a reasonable timeframe.

There are a couple of things you could help to get things rolling on this issue (this is an automated message, so expect that some of these are already in use):

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Thanks again for your contributions! Even though we haven't been able to get this issue fixed, we hope you to report your findings and enhancement ideas in the future too!

[stale]

The issue was automatically closed due to inactivity. If you found some new details to it or started working on it, comment on the issue so that maintainers can re-open it.