Backport: Fix IMAP search issues #1612
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The code had several issues with existing IMAP UID search: * net-imap <= v0.3 returns `nil` when the server returns nothing. (>= v0.4 returns an empty array when the server returns nothing.) * net-imap v0.4.8 and v0.4.9 return a _frozen_ `SearchResult`. `SearchResult` inherits from `Array`, but because it's frozen, mutating it with `reverse!` results in an exception. See ruby/net-imap#262. (v0.4.10 and above doesn't freeze SearchResult.) * newer net-imap (>= 0.5) will support servers that send `ESEARCH` results, but those will be returned as an `ESearchResult` struct (probably frozen). `IMAP4rev1` servers shouldn't return `ESEARCH` unless the client has activated that extension, but `IMAP4rev2` servers will _always_ return `ESEARCH`. * RFC3501 says nothing about sorting the UIDs that come back from `UID SEARCH`. Almost all servers do return sorted UIDs, most of the time. But it isn't 100% reliable. The fix is simple: * use `#to_a` to convert both `nil` and `ESearchResult` into an array. * use `#sort` to ensure the UIDs are sorted. This also returns a new array, without mutating the original (which may be frozen).
nevans
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Jun 3, 2024
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This PR simply cherry-picks #1611 onto the
2-8-stablebranch