[v14] desktop access: soften the disconnect error #34421
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If the Windows host (RDP server) decides to terminate the connection, it often sends a message indicating why the disconnect is coming. One example of a server-initiated disconnect would be when the user clicks "log off" in the RDP session or when they restart the remote machine. We forward this message to the UI, but we put it in a big red ERROR box that makes it look like something went wrong. Errors should be reserved for unexpected disconnections, so covert the dialog to "info" level and soften the messaging.
With the prior commit, we successfully made server-side disconnects look less like errors, but we also made some real errors (like connection time outs) look less like errors. Now, we render an error indicator when we have an unexpected disconnect. We also add a special check for "RDP connection failed" which is used to indicate that the connection was never established succesfully. This also fixes an ancient bug where our strings had an extra unprintable byte at the end. This is because the TDP codec was interpreting the "severity" byte as part of the string, rather than reading only the length that was specified in the message.
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Backport #33941 to branch/v14