Gmail fails to search for Japanese words.

If you search for a string containing Japanese characters, the following exception will occur and the search will fail.

version 1.6.2

BX33 SEARCH UNDELETED OR OR OR OR OR FROM "i??i??A￣" TO "i??i??A￣" CC "i??i??A￣" BCC "i??i??A￣" SUBJECT "i??i??A￣" BODY "i??i??A￣" ALL

Caused by: com.sun.mail.iap.BadCommandException: E4 BAD Could not parse command
at com.sun.mail.iap.Protocol.handleResult(Protocol.java:439)
at com.sun.mail.imap.protocol.IMAPProtocol.issueSearch(IMAPProtocol.java:2596)
at com.sun.mail.imap.protocol.IMAPProtocol.search(IMAPProtocol.java:2501)
at com.sun.mail.imap.protocol.IMAPProtocol.search(IMAPProtocol.java:2486)
at com.sun.mail.imap.IMAPFolder.search(IMAPFolder.java:2375)

An open pull request (#131) is already linked, so review that work first. Start from the IMAPFolder.search and IMAPProtocol.search stack-trace entry points and reproduce the Japanese-character search against the reported version. Done means Gmail accepts the generated search and the exception no longer occurs.

Written by the indexing model from the issue text.