fix: don't crash on utf18 autocompletion#1129

alexanderadam wants to merge 2 commits intoruby:masterruby/irb:masterfrom

alexanderadam:fix/dont_crash_on_utf16_method_autocompletionalexanderadam/irb:fix/dont_crash_on_utf16_method_autocompletionCopy head branch name to clipboard