Auto hide filtered search input placeholder
This auto hides the filtered search input placeholder based on what is provided in the filtered search visual tokens + value from input
MR Structure
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8969#mr-structure
Screenshot
Related MRs
filtered-search-visual-tokens - !8969 (merged)
26652-add-token-ui-for-filtered-search-bar - !8892 (merged)
fix-filtered-search-clear-button - !9427 (merged)
fix-filtered-search-input-placeholder - !9429 (merged)