vmui: title may be improperly updated in the tooltip when hovering graph lines

[valyala]

Describe the bug

Sometimes vmui leaves the previous title for the graph line after quick mouse move from one line to another.

To Reproduce

1. Open https://play.victoriametrics.com/select/accounting/1/6a716b0f-38bc-4856-90ce-448fd713e3fe/prometheus/graph/?g0.expr=(%0A%20%20alias(running_sum(rand(1)%20-%200.5)%2C%20%22r1%22)%2C%0A%20%20alias(running_sum(rand(2)%20-%200.5)%2C%20%22r2%22)%2C%0A)&g0.range_input=3h&g0.end_input=2022-12-24T06%3A02%3A09&g0.relative_time=last_3_hours
2. Hover the r1 graph around the point where r1 graph crosses the r2 graph. Note that the graph title is correct in the appeared tooltip, e.g. it is r1.
3. Move the mouse to the closest point of the r2 graph. Note that the graph title is incorrect in the appeared tooltip, e.g. it is r1 instead of r2.

Expected behavior

The graph title should be properly updated to r2 when hovering r2 line.

Possible workaround

Move the cursor outside graph lines and then return the cursor back to r2 graph. The graph title in the appeared tooltip becomes correct, e.g. it is r2.

[valyala]

The bug has been fixed in b8bc624 . The commit will be included in the next release of VictoriaMetrics. In the mean time it is possible to build VictoriaMetrics from this commit according to these instructions and verify the bug is properly fixed.

[valyala]

The bug has been fixed in v1.86.0. Closing it then.