It is difficult to theme the inputs in this form separately from other search forms.
I'd like to be able to add a unique theme suggestion to both the search input and the submit button.
The default theme hook for the search input is input__search
and the default theme hook for the search submit input is input__submit
These are the same as any other search input which may be on the page.
The theme_hook_original can be seen in $variables inside a hook_theme_suggestions_input_alter()
There is an open issue to add "context" to form elements, see ✨ Add a "context" array variable to all theme hooks and "#context" array property to all elements to provide optional contextual data Needs work
However in the meantime adding another suggestion to the form elements here would make it easier to theme these inputs separately from any other submit or input type="search".
Fixed
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
It seems like a good solution to me.
It is already possible to achieve that with custom code using hook_form_alter and hook_theme_suggestions_HOOK_alter. But I agree that this code is pretty small and can help developers spending less time on trying to customize.
I rerolled your patch because it was not applying anymore.
Automatically closed - issue fixed for 2 weeks with no activity.