Encryption is not considered a change by the :x command

When we look at the quickref documentation we find:

:xit    :x[it][!] [file]      like ":wq" but write only when changes have

                                   been made

If we open an existing file and we do not do any changes except for changing the encryption key(with the ":X" command) and then use the ":x" command to exit, the changes to the encryption key will not be applied. Note that the ":X" is not mandatory to be used, the behavior is the same even if we use ":set key=value". By changing the encryption key I mean all 3 scenarios(1 - file is not encrypted to file is encrypted; 2 - file is encrypted to file is encrypted, but with a different key; 3 - file is encrypted to file is not encrypted), since a key with an empty value means the file is not encrypted.

Note that ":wq" does change the encryption.

Is this a bug? Is it intended? Anyways, I just wanted to leave this here for people to know the workaround. If it's a bug, I'm willing to report one on github.

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