RFR: 8284690: [macos] VoiceOver : Getting java.lang.IllegalArgumentException: Invalid location on Editable JComboBox

[Alexander Zuev]

Check for the available range on the document model and adjust text range request accordingly.

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Commit messages:
 - 8284690: [macos] VoiceOver : Getting java.lang.IllegalArgumentException: Invalid location on Editable JComboBoxaaaa

Changes: https://git.openjdk.java.net/jdk/pull/8820/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8820&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284690
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8820.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8820/head:pull/8820

PR: https://git.openjdk.java.net/jdk/pull/8820