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Fix #18685: Drag drop interaction using keyboard when multiple items allowed (#25343)
Fix #24883 Removing the oppia lightweight root . (#25416)
Apply prettier 2 (#19862)
Fix #7092: Remove downgradeComponent (#21903)
Fix #9311 - Use TestBed.inject instead of TestBed.get (#24729)
Fix issue #20405: Add Duplicate answer group in the validation warning list, Display warning message for all interaction error (#22062)
Fix part of #25997: Replace async() with waitforasync() (#26473)