Remove unneeded predicate
Minor: space
Minor: indent
Fix #1707 "Assertion error when xf:output used in XBL LHHA"

- make xf:output visitable
- don't use `cursor: pointer` on xf:output label
- fr:error-summary: don't focus on output controls
Fix #1708 "FB: Dropdown has duplicate empty item if not "[Select...]""
Fix #1709 "Remove support for src on LHHA"