In #2917594: Add support for HTML5 placeholder in views exposed filters → , placeholder text support was added for StringFilter and NumericFilter. This functionality would also be very useful for when a core search filter is exposed in views.
The same code that was used in that earlier issue for StringFilter could easily be extrapolated for the Search Filter.
Needs work
10.1 ✨
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.
By adding a new schema option we will need an upgrade hook for existing sites.
That update hook will also need tests.
Thanks!