Dialog: Workaround broken focus re-triggering in jQuery 3.4/3.5 #1946
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Focus re-triggering in jQuery 3.4/3.5 makes the original element
have its focus event propagated last, breaking the re-targeting.
Trigger focus in a delay in addition if needed to avoid the issue.
This fixes the "interaction between overlay and other dialogs" core dialog
test when tested against jQuery 3.4/3.5.
Ref jquery/jquery#4382