sync editor text at measure bar.

app.py

@@ -198,8 +198,13 @@ def run_generation (prompt, measures, temperature, max_patches, seed, store, top
 			top_k=int(top_k), top_p=float(top_p), measures=meas, seed=int(seed)):
 			if not done:
 				n_yields += 1
-			# stream: update log (chronological system log + inline output) + editor
-			yield _log_panel(raw), pretty, gr.update(), store
+			# The log streams every patch (raw text). The editor, however, must stay
+			# syntactically valid: only sync it at a measure boundary — i.e. when the
+			# accumulated text ends with the measure separator `|` (so it never shows a
+			# half-generated, incomplete measure). `done` forces a final sync.
+			at_boundary = raw.rstrip().endswith('|')
+			editor_update = pretty if (at_boundary or done) else gr.update()
+			yield _log_panel(raw), editor_update, gr.update(), store
 	except Exception as e:
 		LOG.exception('generation failed: %s', e)
 		yield _log_panel(raw), pretty, gr.update(), store