`reflowTillNow` will strip trailing spaces, but then `reflownTo` may point after the full content of `result`. Need to fix `reflownTo` to not point after the full content of `result`, otherwise a `StringIndexOutOfBoundsException` may occur.
------------- Commit messages: - 8261450: JShell crashes with SIOOBE in tab completion Changes: https://git.openjdk.java.net/jdk/pull/2812/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2812&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8261450 Stats: 16 lines in 2 files changed: 13 ins; 0 del; 3 mod Patch: https://git.openjdk.java.net/jdk/pull/2812.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2812/head:pull/2812 PR: https://git.openjdk.java.net/jdk/pull/2812
