[Bug 106737]

[Jorgk-bmo]

I did a bit of debugging. folderPane.js:2605, folder.rename(aName, msgWindow);, calls nsImapMailFolder::Rename() which calls nsImapService::RenameLeaf() and that opens this URL via GetImapConnectionAndLoadUrl():
  "imap://user@mail.com@server:143/rename>.INBOX.TestMessages>.INBOX.testMessages"
Later we came into nsImapIncomingServer::OnlineFolderRename() and nsImapMailFolder::RenameClient() which does indeed call nsMsgDBFolder::PropagateDelete() as a comment in the patch suggests.

So that's all very well, but there appears to be some code missing to
remove the no longer existing folder from the UI.

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https://bugs.launchpad.net/bugs/106737

Title:
  Renaming folder to same name but different case not allowed

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