Frontend for clarifying the usefulness of the search bar
Description
With #35269 (closed) we're removing the “project switcher” from the breadcrumbs to avoid duplicating existing functionality. The current search bar already searches projects, groups, project pages, settings, and help pages — it's an incredibly powerful and useful tool, yet it's too subtle and unnoticed for any kind of user. We need to make this functionality clearer and accessible to everyone. This will be a step in the direction of making the search bar become more of an omnibox, Spotlight, or Alfred.
Proposal
Resting state:
 
- Increase the width of the search box to 240px
- Remove the scope indicator (This groupandThis project).
- Rephrase the placeholder to: “Search or jump to…”
When the search bar becomes active:
| Project | Group | Global | 
|---|---|---|
|  |  |  | 
- The width of the search box should increase to 320pxfor more comfortable typing.
- The width of the suggestions dropdown should be 320px
- The separator between the options for issues and MRs should be removed.
- The headers that indicate the scope should be as follows:
- Project: Name of the project(no change)
- Group: Name of the group(no change)
- Global: All GitLab
 
- Project: 
- The style of these headers should match the 'Header title' style from the dropdown library spec previews.
Once the user starts typing:
 
[Examples for all the possible row types can be found here]
- The max height of the suggestion dropdown should be 400px
- There should be a fade effect layer at the bottom to indicate the dropdown is scrollable.
- All substrings inside the dropdown which match the query should be bolded.
- The first row should be automatically highlighted, so the user can just press Enterto search.
- The first rows in the dropdown should allow the user to perform a search for the entered term:
- Search rows for project scope:
- Row 1: Magnifying glass+"KEYWORD" in this project
- Row 2: Magnifying glass+"KEYWORD" in all GitLab
 
- Row 1: 
- Search rows for group scope:
- Row 1: Magnifying glass+"KEYWORD" in this group
- Row 2: Magnifying glass+"KEYWORD" in all GitLab
 
- Row 1: 
- Search row for global scope:
- Row 1: Magnifying glass+"KEYWORD" in all GitLab
 
- Row 1: 
 
- Search rows for project scope:
After that, navigation suggestions will be shown for projects, groups, pages inside the project/group, preferences pages and help pages that match the string entered.
- Project and group rows will show their avatar on the left side.
- The size of the avatar will be 16px x 16px
- The margin between the avatar and the name will be 4px
- If the project or group doesn't have an avatar, the generic one with its initial should be used.
 
- The size of the avatar will be 
- The headers for each type of suggestion should also be updated to match the spec previews
- The header for pages in the project or group should be renamed to:
- Project: In this project
- Group: In this group
 
- Project: 
Links / references
- Related: #35010 (closed)
- Spec previews