REPL: tab completion: results are unordered when tabbing immediately after `.`

[SethTisue]

if I type at least one character, completions are in alphabetical order, as expected:

scala 2.13.4> "foo".a<TAB>
addString(                 andThen(                   appendedAll(               applyOrElse(
aggregate(  (deprecated)   appended(                  apply(                     asInstanceOf (universal)

but if I tab immediately after ., they aren't:

scala 2.13.4> "foo".<TAB>
toCharArray()                       empty                               formatted(            (universal)               takeWhile(                          prefixLength(        (deprecated)   takeRight(                                      unapply(                            view                                filterNot(                                      toByte                              inits                               unzip(                                          andThen(                            toUpperCase()                       notify()              (universal)               patch(                              lazyZip(                            partitionMap(                                   iterator                            codePoints()                        toLongOption                                    prependedAll(                       last                                map(                                            toDouble                            unzip3(                             ++(                                             trim()                              count(                              :\(                  (deprecated)               mkString                            eq(                   (universal)   product(                                        sortBy(                             reverseIterator                     max(                                            equ
...

what the hell?

[SethTisue]

I tried adding a little test to CompletionTest.scala, and it seems the results are coming back in order, internally: List(!=, ##, *, +, +, ++, ++, ++, ++, ++:, ++:, +:, +:, ->, /:, :+, :+, :++, :++, :\, <, <=, ==, >, >=, addString, addString, addString, aggregate, andThen, andThen, appended, appended, appendedAll, appendedAll, apply, applyOrElse, asInstanceOf, canEqual, capitalize, charAt, charStepper, chars, codePointAt, codePointBefore, codePointCount, codePointStepper, codePoints, collect, ...

so is actually this some weird JLine issue? maybe it will go away if we can make the grouping UI work, as part of #12272 ?

[jxnu-liguobin]

It seams look good in 2.13.5.

[griggt]

This reminds me of scala/scala3#11488 which was fixed by upgrading to JLine 3.19.0.