Prevent save-buffer in Rmail buffers from using the coding-system
of the current message, and from clobbering the encoding mnemonics in the mode line (Bug#4623). (rmail-swap-buffers): Swap encoding and modified flag, too. (rmail-message-encoding): New variable. (rmail-write-region-annotate): Record the encoding of the current message in rmail-message-encoding. (rmail-after-save-hook): New function, restores the encoding of the current message after the message collection is saved.
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