From 2044049a7f36c5dd5726d21e574ff978abbbc32b Mon Sep 17 00:00:00 2001
From: JavaZeroo <71128095+JavaZeroo@users.noreply.github.com>
Date: Fri, 30 Oct 2026 02:17:41 +0800
Subject: [PATCH] diagnose(shell): flag resize repaint batches in the output
 trace refs #194

A chunk containing the cursor-hide plus home prefix is marked repaint:true together with the grid it was consumed at, which is the missing input for deciding whether the repaint was generated before or after the resize.
---
 experiments/shell/shell.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/experiments/shell/shell.cpp b/experiments/shell/shell.cpp
index 6a857d18..8cd836ca 100644
--- a/experiments/shell/shell.cpp
+++ b/experiments/shell/shell.cpp
@@ -842,11 +842,15 @@ class ShellWindow {
             // resize-triggered repaint apart from ordinary output in a failure
             // artifact; nothing is written unless the variable is set.
             if (trace_output_) {
+                // A resize repaint starts by hiding the cursor and homing it;
+                // flagging it lets the trace show whether the batch was built
+                // for the previous grid but consumed with the new one.
+                const bool repaint = bytes.find("\x1b[?25l\x1b[H") != std::string::npos;
                 trace_output_ << "{\"schema\":\"termforge-output-trace-v1\",\"terminal\":" << identity_
                               << ",\"t_ms\":" << GetTickCount64()
                               << ",\"offset\":" << trace_offset_ << ",\"bytes\":" << bytes.size()
                               << ",\"columns\":" << parser_.screen.width() << ",\"rows\":" << parser_.screen.height()
-                              << "}\n";
+                              << ",\"repaint\":" << (repaint ? "true" : "false") << "}\n";
                 trace_output_.flush();
                 trace_offset_ += bytes.size();
             }