bug(material/table): Row hover effect is not working since v17.2 (maybe earlier)
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- TypeScript
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Description
### Is this a regression?
- [X] Yes, this behavior used to work in the previous version
### The previous version in which this bug was not present was
Angular 16
### Description
In Angular Material 16, it was possible to have an hover effect on the entire row of tables, as demonstrated in #26203 (as long as we were able to workaround the bug described in #26203).
After a migration to Angular Material 17, the hover effect disappeared. And it is still not back in v18.
The [spec defines row hover](https://m2.material.io/components/data-tables#behavior), and [MDC supports it ](https://github.com/material-components/material-components-web/blob/cfec83c749a1b6b6602c4d2fa474d3e776e7c97b/packages/mdc-data-table/_data-table-theme.scss#L411).
### Reproduction
You might clone the reproduction repository locally via https://github.com/PowerKiKi/mat-table-v17-does-not-highlight-rows-on-mouseover-anymore. It includes branches for v16.1, v17.2, v17.3 and v18.0.
Or else, see the repo directly on StackBlitz:
- [On v16.1](https://stackblitz.com/~/github.com/PowerKiKi/mat-table-v17-does-not-highlight-rows-on-mouseover-anymore/tree/v16.1), mouseover will works.
- [On v17.2](https://stackblitz.com/~/github.com/PowerKiKi/mat-table-v17-does-not-highlight-rows-on-mouseover-anymore/tree/v17.2), mouseover will not work anymore.
- [Even on the latest v18.0](https://stackblitz.com/~/github.com/PowerKiKi/mat-table-v17-does-not-highlight-rows-on-mouseover-anymore/tree/v18.0), mouseover will not work anymore
### Expected Behavior
Row hover effect must be either be enabled by default, like in v16, or if it might break sticky columns as described in #26730, it should be at least enableable via an attribute/config somewhere.
### Actual Behavior
Row hover effect is not happening anymore.
### Environment
- Angular: 16.1 / 17.2
- CDK/Material: 16.1 / 17.2
- Browser(s): Chrome 125
- Operating System (e.g. Windows, macOS, Ubuntu): Ubuntu
Contributor guide
Research direction
Start by comparing the v16.1, v17.2, v17.3 and v18.0 branches in the linked reproduction repository, then inspect the referenced MDC data-table theme rules and related issues #26203 and #26730. Done means row hover works again in the affected Angular Material table while preserving the sticky-column behavior discussed in #26730.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- angular, typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100