ssh domains: use default local echo threshol

The implementation of this is a bit gnarly, because we have
an optional value with a default that *is* populated by the
dynamic config stuff, but that isn't part of the derive(Debug)
impl.

closes: #5547

config/src/ssh.rs

@@ -119,13 +119,15 @@ impl SshDomain {
                 name: format!("SSH:{host}"),
                 remote_address: host.to_string(),
                 multiplexing: SshMultiplexing::None,
+                local_echo_threshold_ms: default_local_echo_threshold_ms(),
                 ..SshDomain::default()
             });
 
             mux_ssh.push(Self {
                 name: format!("SSHMUX:{host}"),
                 remote_address: host.to_string(),
                 multiplexing: SshMultiplexing::WezTerm,
+                local_echo_threshold_ms: default_local_echo_threshold_ms(),
                 ..SshDomain::default()
             });
         }

docs/changelog.md

@@ -93,6 +93,8 @@ As features stabilize some brief notes about them will accumulate here.
   `pixel_height`.
 * ssh: we now explicitly kill and reap the `ProxyCommand` associated
   with an ssh session. Thanks to @daaku! #5494 #5479
+* `default_ssh_domains()` didn't use the default local echo threshold
+  for ssh domains. #5547
 
 #### Updated
 * Bundled conpty.dll and OpenConsole.exe to build 1.19.240130002.nupkg