Preserve Input Search Value

Nice feature.
Should we make this a checkbox in the block configuration to enable or disable this feature? And we would enable this by default.

- If people want to customize in their theme, it might be best to have an option to not add any javascript.
- It might be best if the javascript was based on a class that we add ourselves because in a theme the class "form-search" could be missing or used in other spots.

I thought about something like this:

This patch worked for me!

Converted patch#7 to MR.

I have reproduced the issue successfully.
The MR8 is applied cleanly.

I followed the steps below to reproduce the issue:

1.Cloned the 1.0.x version of the module.
2.Installed its dependencies and enabled both modules.
3.Create a view for content and add exposed filter and configure
4.add serach api form by configuring it with key and action view url
5.Reproduced the issue both without MR8 changes and with MR8 applied.
Changing its status to RTBC.

I would probably set the cache to only be set on the query parameter and not the whole URL. That way we have a unique cache when the parameter is not there.

$form['#cache']['contexts'][] = 'url.query_args:' . $input_name;

PS: I didn't test this code, just followed the documentation:
https://www.drupal.org/docs/drupal-apis/cache-api/cache-contexts →

here's updated version of patch

@phjou I agree your solution is better. The cache variation then would only depend on the specific query argument based on the input field name and not on the entire URL. So even if other query args are present, the cached data would ignore those.

Btw. cool feature : )