Use standard dropdowns for autocomplete

[zbynek]

Further reduces usage of YUI by switching autocomplete fields to the dropdown component.

Screenshots

Before

After

Testing done

Manual testing with the job trigger for freestyle jobs (see screenshot)

No automated tests -- this could be only covered by UI tests and I'm not sure those would be worth adding/maintaining.

Proposed changelog entries

• Use dropdown component for autocomplete fields (instead of YUI framework).

Proposed upgrade guidelines

N/A

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@mention

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[timja]

LGTM worked in testing on a freestyle project and on the design library

[janfaracik]

Looks good to me - any thoughts on making the dropdown full width?

[zbynek]

any thoughts on making the dropdown full width?

I don't have a preference. @timja @NotMyFault WDYT?

[timja]

any thoughts on making the dropdown full width?

I don't have a preference. @timja @NotMyFault WDYT?

is that after or before?

[zbynek]

The last screenshot is potential after (not implemented), screenshot of the current implementation is in the PR description.

[timja]

Current one is cut-off though so can't really see the impact of the change unless I'm misunderstanding

[zbynek]

Without cutoff:

The upside is that with more suggestions the narrow popup covers fewer UI elements, the downside is that validation of partial input may be visible below (as shown in the screenshot in description).

[timja]

Ah I see, I think full width is better but no strong preference

[zbynek]

Full width pushed, this is now ready from my side, thanks for the feedback.