Drag mode hides tooltips, but not custom tooltips

[jledentu]

Hi,

I met some inconsistency between regular/custom tooltips on zoom in drag mode.
If tooltips are enabled, there are hidden during dragging, as you can see in this fiddle (tested in Firefox 70 and Chromium 78), although it's not explicitly handled by the zoom plugin. I think it's because the update call in the mouseover handler.

However, tooltips.custom is called while dragging, as you can see here.

I think we should explicit the behaviour in the plugin?

[etimberg]

Updated fiddles for v3
Regular tooltip: https://jsfiddle.net/dof9bgzt/
Custom tooltip: https://jsfiddle.net/m28kyL7u/

[jledentu]

As a workaround, I wrote a custom plugin that disables custom tooltips when dragging:

beforeUpdate(chart) {
  chart.tooltip.prevent = !!chart.$zoom._dragZoomStart;
},

And in my tooltip callback, I early return if chart.tooltip.prevent is true. It's a bit ugly, so it would be nice if the plugin disabled tooltips natively. I don't know how to disable tooltips in a given update (by setting the _active property of the tooltip plugin?).