Only add `[...]` omission marker if stderr buffer is full

binaries/daemon/src/lib.rs

@@ -1183,7 +1183,11 @@ impl Daemon {
                                 stderr: dataflow
                                     .and_then(|d| d.node_stderr_most_recent.get(&node_id))
                                     .map(|queue| {
-                                        let mut s = String::new();
+                                        let mut s = if queue.is_full() {
+                                            "[...]".into()
+                                        } else {
+                                            String::new()
+                                        };
                                         while let Some(line) = queue.pop() {
                                             s += &line;
                                         }

libraries/core/src/topics.rs

@@ -162,7 +162,7 @@ impl std::fmt::Display for NodeError {
             NodeErrorCause::Other { stderr } if stderr.is_empty() => {}
             NodeErrorCause::Other { stderr } => {
                 let line: &str = "---------------------------------------------------------------------------------\n";
-                write!(f, " with stderr output:\n{line}[...]\n{stderr}{line}")?
+                write!(f, " with stderr output:\n{line}{stderr}{line}")?
             },
         }