When the project list (Admin > Projects) is paginated the filter box causes only the list in the current page to be filtered. So if a project one is looking for does not exist in the current page filter does not return any results. This can be confusing.
In my opinion, a benefit that such filter should provide is to find a project when thousands of projects are available. no matter on what result page that project is located.
To replicate:
1. Create about 20 projects (use command line for convenience: "keystone --os-username admin --os-password **** --os-auth-url http://localhost:5000/v2.0 --os-tenant-name admin tenant-create --name=proj01")
2. Login to Horizon and go to Admin > Projects
3. The list should be paginated with a default 20 projects in each page
4. Filter and type in a project name that is not in the current page list. It would not return the project you're looking for even though it's listed in the other page.
I agree this is something that is needed in general across all (or most) tables. This behavior was recently added to the admin instances table and it seems to me other tables should be updated to use it.
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