Spring Avoid unescape when CONNECT and CONNECTED frames

I faced an error that stomp websocket client can not send a header with backslash. Then I found reason.

StopmEncoder dose not escape headers when CONNECT and CONNECTED frames, to follow the spec below: https://stomp.github.io/stomp-specification-1.2.html#Value_Encoding However, StompDecoder try to unescape when CONNECT and CONNECTED frames.

StopmDecoder should not unescape when CONNECT and CONNECTED frames, because the frames are not escaped.

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