RFR: Fix the HunkCoalescer again

[Erik Helin]

Hi all,

seems like the `HunkCoalescer` wasn't finished with me just yet. I forgot about some end-of-file use cases and also applied my previous fix in the wrong place. This time however it works, many thanks to @JornVernee for testing and reporting the additional bugs.

Thanks,
Erik

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Commits:
 - c0c399ca: Fix the HunkCoalescer again

Changes: https://git.openjdk.java.net/skara/pull/214/files
 Webrev: https://webrevs.openjdk.java.net/skara/214/webrev.00
  Stats: 12 lines in 1 file changed: 6 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/214.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/214/head:pull/214

PR: https://git.openjdk.java.net/skara/pull/214