The tooltip of the install-per-version chart stops working when switching chart

[stof]

On the initial page load, the new install-per-version chart has a tooltip on hover giving the value. But as soon as you switch to a different chart, the tooltip stops working (even when going back to the initial chart).

[glaubinix]

I can reproduce this in firefox for version install graphs. Seems to work fine in webkit based browsers (safari, chrome, brave). No errors in the dev console.

[Seldaek]

The NVD3 lib used for charting is way outdated and kinda dead, so I'd probably consider switching to Vega instead, it seems to support what we need https://vega.github.io/vega-lite/examples/interactive_overview_detail.html https://vega.github.io/vega-lite/tutorials/getting_started.html#embed - this isn't super urgent though.