[8.x] [TSVB] fix point visibility regression (elastic#202358) (elasti…

…c#202639)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[TSVB] fix point visibility regression
(elastic#202358)](elastic#202358)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Marco
Vettorello","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-12-03T09:27:58Z","message":"[TSVB]
fix point visibility regression (elastic#202358)\n\n## Summary\r\n\r\nfix
https://github.com/elastic/kibana/issues/200255\r\n\r\nThe regression
was caused by a
[breaking\r\nchange](elastic/elastic-charts#2525)
introduced\r\nby elastic-charts around the `area.points.visible` style,
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'auto'`;","sha":"a7397b2ce23c22e06af246eca59c32c63dc63cdb","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Feature:TSVB","regression","release_note:fix","Team:Visualizations","v9.0.0","v8.16.0","backport:version","v8.17.0","v8.18.0"],"title":"[TSVB]
fix point visibility
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fix point visibility regression (elastic#202358)\n\n## Summary\r\n\r\nfix
https://github.com/elastic/kibana/issues/200255\r\n\r\nThe regression
was caused by a
[breaking\r\nchange](elastic/elastic-charts#2525)
introduced\r\nby elastic-charts around the `area.points.visible` style,
that passed\r\nfrom a `boolean` to a union of `'always' | 'never' |
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fix point visibility regression (elastic#202358)\n\n## Summary\r\n\r\nfix
https://github.com/elastic/kibana/issues/200255\r\n\r\nThe regression
was caused by a
[breaking\r\nchange](elastic/elastic-charts#2525)
introduced\r\nby elastic-charts around the `area.points.visible` style,
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BACKPORT-->

Co-authored-by: Marco Vettorello <[email protected]>

src/plugins/vis_types/timeseries/public/application/visualizations/views/timeseries/utils/series_styles.js

@@ -27,7 +27,7 @@ export const getAreaStyles = ({ points, lines, color }) => ({
       radius: points.radius || 0.5,
       stroke: color || DEFAULT_COLOR,
       strokeWidth: points.lineWidth || 5,
-      visible: points.lineWidth > 0 && Boolean(points.show),
+      visible: points.lineWidth > 0 && Boolean(points.show) ? 'always' : 'never',
     },
   },
   curve: lines.steps ? CurveType.CURVE_STEP_AFTER : CurveType.LINEAR,