Issue #393538 by Liam Morland, valthebald, dmitrig01, David_Rothstein: Document that check_plain() can issue PHP messages on invalid UTF-8 input.
Issue #2310415 by cilefen, ednawig, TravisCarden: Fixed run-tests.sh does not handle the error when invalid test groups/classes are specified.
Issue #393538 followup by David_Rothstein: Fixed code style error in check_plain() documentation.
Issue #2147321 by manfer: Fixed Unnecessary space in session-active class.