No autocomplete user name shows after typing user email

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.0 CE GA1, 7.3.10 DXP GA1, Master
• Component/s: Asset Sharing Framework
• Labels:
  • QA-AUTOMATION
  • qa-escalated
• Story Points: 3
• Fix Priority: 3
• Sprint: LIMA | #08 | Nov26-Dec10, LIMA | #09 | Dec10-Dec20
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/81800
• Bug Type: Regression Bug
• QA Test Name:
  • LocalFile.BlogsSharing#AssertNotifications
  • LocalFile.BlogsSharing#ShareWithCommentPermissions
  • LocalFile.BlogsSharing#ShareWithUpdatePermissions
  • LocalFile.DMSharing#AssertNotifications
  • LocalFile.DMSharing#AssertSingleDeleteEntry
  • LocalFile.DMSharing#AssertSingleEntry
  • LocalFile.DMSharing#GoToSharedContentViaEmail
  • LocalFile.DMSharing#GoToSharedContentViaNotifications
  • LocalFile.DMSharing#ManageCollaborators
  • LocalFile.DMSharing#ReplyToCommentViaSharedContent
  • LocalFile.DMSharing#ShareViaSharedContent
  • LocalFile.DMSharing#ShareWithNoSharingPermissions
  • LocalFile.DMSharing#ViewAndRemoveCollaborators
  • LocalFile.DepotDocuments#ShareDocument
  • LocalFile.SharingUsecase#OrderBySharedDate
  • LocalFile.StagingBlogs#ShareBlogsEntryOnLiveSite
  • LocalFile.StagingDM#ShareDMDocumentOnLiveSite
• QA Test Score: 74

Steps to reproduce:

1. Add user([email protected])
2. Add a blog entry
3. Go to blog entry > Share
4. Type user email([email protected], or [email protected])

Expected results: Autocomplete, the full user name will show under dropdown.
Actual results: No autocomplete user name shows after typing user email. If type test1, then dropdown list shows, it seems autocomplete user only according to user name now.

NOTE: DM sharing also has this issue.