diff --git a/scripts/measure/live-code-shell.sh b/scripts/measure/live-code-shell.sh
index 0af71e3f33c3..f47de56cbc27 100755
--- a/scripts/measure/live-code-shell.sh
+++ b/scripts/measure/live-code-shell.sh
@@ -2,7 +2,8 @@
 # Live code, measured end to end in the view shell (Prototypes/ViewShell/README.md, "Live code"):
 # builds the Debug shell, runs it headless with a live folder, edits Badge.swift (a padding and a
 # colour, which also changes the badge's view type), compiles and drops the patch, and times the
-# edit to the redrawn badge's pixels. Then a stored property edit, which must not apply live.
+# edit to the redrawn badge's pixels. Then a new file the badge uses (named nowhere: inject.sh takes
+# it along), and a stored property edit, which must not apply live.
 #   scripts/measure/live-code-shell.sh OUT     (OUT: a folder for the log, the PNGs and result.json)
 set -euo pipefail
 out="${1:?usage: live-code-shell.sh OUT}"
@@ -22,6 +23,7 @@ shell=$!
 restore() {
   kill "$shell" 2>/dev/null || true
   [[ -f "$out/Badge.swift.orig" ]] && cp "$out/Badge.swift.orig" "$package/Sources/ViewShell/Badge.swift"
+  rm -f "$package/Sources/ViewShell/LiveCodeProbeDot.swift"
   rm -rf "$live"
 }
 trap restore EXIT
@@ -59,25 +61,54 @@ drawn2=$(grep "redrawn generation=2" "$out/shell.log" | sed 's/.*at=//')
 repatched="no: generation 2 drew the same picture as generation 1"
 cmp -s "$out/generation-1.png" "$out/generation-2.png" || repatched="yes"
 
-# 3. A new stored property (a SwiftUI `@State`, whose layout the runtime fills in): refused.
-sed -i '' -e 's/    let text: String/    let text: String\n    @State private var extra = 0/' "$package/Sources/ViewShell/Badge.swift"
+# 3. A new file with a new view, used by the badge. Only Badge.swift is named; the build never
+# compiled the new file, so inject.sh links it into the patch too.
+edit3=$(now)
+cat >"$package/Sources/ViewShell/LiveCodeProbeDot.swift" <<'SWIFT'
+import SwiftUI
+
+// Written by scripts/measure/live-code-shell.sh and removed when it ends: a new file in a patch.
+struct LiveCodeProbeDot: View {
+    var body: some View { Circle().fill(.green).frame(width: 6, height: 6) }
+}
+SWIFT
+sed -i '' -e 's/^        Text(text)$/        HStack(spacing: 4) { LiveCodeProbeDot(); Text(text) }/' "$package/Sources/ViewShell/Badge.swift"
 "$package/inject.sh" --live "$live" "$package/Sources/ViewShell/Badge.swift" | tee "$out/inject-3.log" || true
+newfile="not applied"
+drawn3=""
+if wait_for "redrawn generation=3" 30; then
+  drawn3=$(grep "redrawn generation=3" "$out/shell.log" | sed 's/.*at=//')
+  newfile="no: generation 3 drew the same picture as generation 2"
+  cmp -s "$out/generation-2.png" "$out/generation-3.png" || newfile="applied"
+else
+  grep -q "refused" "$out/shell.log" && newfile="refused"
+  kill -0 "$shell" 2>/dev/null || newfile="shell exited"
+fi
+
+# 4. A new stored property (a SwiftUI `@State`, whose layout the runtime fills in): refused.
+# The generation it would draw is the next one (a refused patch draws none).
+next=$(( $(grep -o "redrawn generation=[0-9]*" "$out/shell.log" | tail -1 | sed 's/.*=//') + 1 ))
+refusals=$(grep -c "refused" "$out/shell.log" || true)
+sed -i '' -e 's/    let text: String/    let text: String\n    @State private var extra = 0/' "$package/Sources/ViewShell/Badge.swift"
+"$package/inject.sh" --live "$live" "$package/Sources/ViewShell/Badge.swift" | tee "$out/inject-4.log" || true
 sleep 3
 stored="not applied"
-grep -q "redrawn generation=3" "$out/shell.log" && stored="applied (unsafe: layout changed)"
-grep -q "refused" "$out/shell.log" && stored="refused"
+grep -q "redrawn generation=$next" "$out/shell.log" && stored="applied (unsafe: layout changed)"
+(( $(grep -c "refused" "$out/shell.log" || true) > refusals )) && stored="refused"
 kill -0 "$shell" 2>/dev/null || stored="shell exited"
 cp "$out/Badge.swift.orig" "$package/Sources/ViewShell/Badge.swift"
 
-python3 - "$out" "$build_start" "$build_end" "$edit" "$compiled" "$drawn" "$edit2" "$drawn2" "$repatched" "$stored" <<'PY'
+python3 - "$out" "$build_start" "$build_end" "$edit" "$compiled" "$drawn" "$edit2" "$drawn2" "$repatched" "$edit3" "$drawn3" "$newfile" "$stored" <<'PY'
 import json, sys
-out, b0, b1, edit, compiled, drawn, edit2, drawn2, repatched, stored = sys.argv[1:]
+out, b0, b1, edit, compiled, drawn, edit2, drawn2, repatched, edit3, drawn3, newfile, stored = sys.argv[1:]
 r = {
   "debug_build_s": round(float(b1) - float(b0), 2),
   "edit_to_compiled_s": round(float(compiled) - float(edit), 2),
   "edit_to_pixels_s": round(float(drawn) - float(edit), 2),
   "warm_edit_to_pixels_s": round(float(drawn2) - float(edit2), 2),
   "second_patch_redrew": repatched,
+  "new_file_edit": newfile,
+  "new_file_edit_to_pixels_s": round(float(drawn3) - float(edit3), 2) if drawn3 else None,
   "stored_property_edit": stored,
 }
 json.dump(r, open(f"{out}/result.json", "w"), indent=2)