fix #3761 #3792
fix missing Async module
Merge pull request #3928 from adobe/jasonsanjose/issue-3792-again

Fix live preview refresh issues (again)
string-only change for #3906. UI implementation pending.
Merge pull request #3935 from adobe/jasonsanjose/issue-3906

string-only change for #3906. UI implementation pending.
Updated by ALF automation.