[S] Sphinx-copybutton has two tooltips (custom and native)

[Carreau]

This appear to be on purpose and is not a native tooltip. It is a title for the SVG element:

https://developer.mozilla.org/en-US/docs/Web/SVG/Element/title (tl;dr: short desc of the icon)

So it is meant as a description of the svg icon, it happen to be a native tooltip on some browsers.

I think maybe we can use desc (long desc of the icon) instead of title, which would lead to no tooltip.

[Carreau]

There is already an upstream issue: https://github.com/executablebooks/sphinx-copybutton/issues/200

[trallard]

Not planned as copy-button is not a core dep for PST