Line annotation tooltip not visible even when `hideLinesTooltips` is set to false

[karosowka13]

Describe the issue

When hovering line annotation the line annotation's tooltip doesn't show up. Only while hovering the marker the tooltip appears.
Even with the hideLinesTooltips set to false and high zIndex.
I also tried to disable tooltips with <Tooltip customTooltip={() => null} /> to ensure that tooltip with the value doesn't hide the annotation tooltip, but it didn't solve the issue.

To Reproduce
See this codesandbox.
Steps to reproduce the behavior:

1. Hover over line annotation
2. Hover over marker

Expected behaviour
I would expect to see the line annotation tooltip when we hover over line.

Screenshots

LineAnnotationTooltip.mov

Version (please complete the following information):

• Elastic Charts: 66.1.1

[markov00]

Thanks for submitting the issue, this is actually by design. I've changed the label to enhancement so we can track this request.

[karosowka13]

Thanks a lot.
What's hideLinesTooltips prop for then?

[nickofthyme]

@karosowka13 the hideLinesTooltips was added some time ago in #339 and the usage of it was removed in #418 but we clearly missed removing that from the types. I opened #2555 to remove hideLinesTooltips.

The original issue that hideLinesTooltips was attempting to solve, was how to nicely display both the main tooltip and the annotation tooltip at the same time, see #297. For the time being we simply settled on displaying the line annotation tooltip when hovering the icon and the rect annotation only when the main tooltip was not displayed. In such case where we want to display the rect annotation message in addition to the main tooltip, we manually inject the contents into the header.

Our next step is to handle this collision better. We have ideas of how to do this such as that mentioned in #615 (comment) and shown below.

But this tooltip work is not our top priority at the moment.