fix code queue trace message fragments

src/components/frontend/src/code-queue.tsx

@@ -921,6 +921,64 @@ function coalesceFileChangeTraceSteps(steps: any[]): any[] {
   return merged;
 }
 
+function traceStepMessageMergeKey(step: any): string {
+  if (String(step?.kind || "") !== "message") return "";
+  const title = String(step?.title || "").trim().toLowerCase();
+  if (title !== "assistant message" && title !== "reasoning") return "";
+  return `${title}:${String(step?.status || "")}`;
+}
+
+function mergeMessageTraceStepGroup(group: any[]): any {
+  if (group.length <= 1) return group[0];
+  const first = group[0];
+  const last = group.at(-1) || first;
+  const rawSeqs = group.flatMap((step) => Array.isArray(step?.rawSeqs) ? step.rawSeqs : [step?.seq]).filter((seq) => seq !== undefined);
+  const seenRawSeqs: any[] = [];
+  for (const seq of rawSeqs) if (!seenRawSeqs.includes(seq)) seenRawSeqs.push(seq);
+  const summaryLines = group
+    .flatMap(traceStepSummaryLines)
+    .filter((line) => line.trim().length > 0);
+  return {
+    ...first,
+    seq: traceStepSeqValue(last) || traceStepSeqValue(first),
+    at: last?.at || first?.at,
+    summaryLines: summaryLines.length > 0 ? [summaryLines.at(-1) || summaryLines[0]] : [],
+    rawSeqs: seenRawSeqs,
+  };
+}
+
+function coalesceMessageTraceSteps(steps: any[]): any[] {
+  const rows = Array.isArray(steps) ? steps : [];
+  const merged: any[] = [];
+  let group: any[] = [];
+  let groupKey = "";
+  const flush = () => {
+    if (group.length > 0) merged.push(mergeMessageTraceStepGroup(group));
+    group = [];
+    groupKey = "";
+  };
+  for (const step of rows) {
+    const key = traceStepMessageMergeKey(step);
+    if (key.length > 0 && key === groupKey) {
+      group.push(step);
+      continue;
+    }
+    flush();
+    if (key.length > 0) {
+      group = [step];
+      groupKey = key;
+    } else {
+      merged.push(step);
+    }
+  }
+  flush();
+  return merged;
+}
+
+function coalesceTraceSteps(steps: any[]): any[] {
+  return coalesceMessageTraceSteps(coalesceFileChangeTraceSteps(steps));
+}
+
 function canonicalExecutionSummary(execution: AnyRecord): AnyRecord {
   return { ...execution };
 }
@@ -1638,7 +1696,7 @@ function ProgressivePromptBlock({ task, loading, onLoadPromptPart, testId = "cod
 }
 
 function ProgressiveExecutionSummary({ task, attempt, attemptIndex, loading, onLoadSteps, onLoadStep, testId = "codex-execution-summary" }: AnyRecord) {
-  const steps = coalesceFileChangeTraceSteps(taskTraceSteps(task, attemptIndex));
+  const steps = coalesceTraceSteps(taskTraceSteps(task, attemptIndex));
   const execution = canonicalExecutionSummary(attemptExecutionSummary(task, attempt));
   const stats = attempt ? attemptOaTraceStats(task, attempt) : taskOaTraceStats(task);
   const stepDetails = taskTraceStepDetails(task);