Hide orphan json fences in chat bubbles (0.15.14).

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app.js

@@ -689,12 +689,25 @@ import { DEFAULT_ASPECT_TABLE, applyAspectTableFromObject as mergeAspectTable }
     }
 
     /** Lightweight chat prose: ### Critique → «Критика», lists, bold — not a full markdown engine. */
-    function formatAssistantProseHtml(raw) {
+    function stripChatFenceArtifacts(raw) {
+        if (window.SA && typeof SA.stripFenceArtifacts === 'function') {
+            return SA.stripFenceArtifacts(raw);
+        }
         let text = String(raw || '').replace(/\r\n/g, '\n');
-        text = text.replace(/(?:^|\n)#{1,6}\s*JSON\s*Patch\s*(?=\n|$)/gi, '\n');
-        text = text.replace(/(?:^|\n)\s*JSON\s*Patch\s*:?\s*(?=\n|$)/gi, '\n');
         text = text.replace(/```(?:json)?\s*[\s\S]*?```/gi, '');
-        text = text.replace(/\n{3,}/g, '\n\n').trim();
+        text = text.replace(/```(?:json)?\s*[\s\S]*$/gi, '');
+        return text.replace(/\n{3,}/g, '\n\n').trim();
+    }
+
+    function liveAssistantText(raw) {
+        if (window.SA && typeof SA.liveStreamProse === 'function') {
+            return SA.liveStreamProse(raw);
+        }
+        return stripChatFenceArtifacts(raw) || String(raw || '');
+    }
+
+    function formatAssistantProseHtml(raw) {
+        let text = stripChatFenceArtifacts(raw);
         if (!text) {
             return '';
         }
@@ -755,7 +768,7 @@ import { DEFAULT_ASPECT_TABLE, applyAspectTableFromObject as mergeAspectTable }
         if (live) {
             body.classList.add('sa-prose', 'sa-prose-live');
             body.classList.remove('sa-prose-rich');
-            body.textContent = raw;
+            body.textContent = liveAssistantText(raw);
             return;
         }
         body.classList.add('sa-prose', 'sa-prose-rich');

src/patch.js

@@ -25,6 +25,7 @@ export function getPatchKeys() {
 }
 
 const FENCE_RE = /```(?:json)?\s*([\s\S]*?)```/gi;
+const OPEN_FENCE_RE = /```(?:json)?/i;
 
 function has(obj, key) {
   return obj[key] !== undefined && obj[key] !== null;
@@ -87,6 +88,30 @@ function tryParsePatchJson(raw) {
   return null;
 }
 
+/** Remove fenced blocks and orphan ```json openers left when JSON was parsed unfenced. */
+export function stripFenceArtifacts(text) {
+  let t = String(text || '').replace(/\r\n/g, '\n');
+  t = t.replace(/```(?:json)?\s*[\s\S]*?```/gi, '');
+  t = t.replace(/```(?:json)?\s*[\s\S]*$/gi, '');
+  t = t.replace(/(?:^|\n)\s*```(?:json)?\s*(?=\n|$)/gi, '\n');
+  t = t.replace(/(?:^|\n)#{1,6}\s*JSON\s*Patch\s*(?=\n|$)/gi, '\n');
+  t = t.replace(/(?:^|\n)\s*JSON\s*Patch\s*:?\s*(?=\n|$)/gi, '\n');
+  return t.replace(/\n{3,}/g, '\n\n').trim();
+}
+
+/** While streaming: hide an unclosed fence tail so ```json does not leak into the bubble. */
+export function liveStreamProse(text) {
+  const t = String(text || '');
+  const open = t.search(OPEN_FENCE_RE);
+  if (open >= 0) {
+    const tail = t.slice(open);
+    if (!/```(?:json)?\s*[\s\S]*?```/i.test(tail)) {
+      return stripFenceArtifacts(t.slice(0, open));
+    }
+  }
+  return stripFenceArtifacts(visibleProse(t) || t);
+}
+
 export function extractPatch(text) {
   if (!text) {
     return { prose: text || '', patch: null };
@@ -117,7 +142,7 @@ export function extractPatch(text) {
   if (chosen) {
     const idx = lastTerminal ? lastTermIndex : lastAnyIndex;
     const len = lastTerminal ? lastTermLen : lastAnyLen;
-    const prose = (text.slice(0, idx) + text.slice(idx + len)).trim();
+    const prose = stripFenceArtifacts(text.slice(0, idx) + text.slice(idx + len));
     return { prose, patch: chosen };
   }
   // Unfenced trailing object — some turns emit raw {prompt, generate:true}.
@@ -125,10 +150,10 @@ export function extractPatch(text) {
   if (brace >= 0) {
     const parsed = tryParsePatchJson(text.slice(brace));
     if (parsed) {
-      return { prose: text.slice(0, brace).trim(), patch: parsed };
+      return { prose: stripFenceArtifacts(text.slice(0, brace)), patch: parsed };
     }
   }
-  return { prose: text, patch: null };
+  return { prose: stripFenceArtifacts(text), patch: null };
 }
 
 /** Chat body text: never fall back to the raw fence when a patch was extracted. */
@@ -137,7 +162,7 @@ export function visibleProse(text) {
   if (patch) {
     return prose || '';
   }
-  return String(text || '');
+  return stripFenceArtifacts(text);
 }
 
 export function isTerminalStreamPatch(obj) {
@@ -180,4 +205,6 @@ export function attachPatch(SA) {
   SA.extractPatch = extractPatch;
   SA.generateFlagOn = generateFlagOn;
   SA.visibleProse = visibleProse;
+  SA.stripFenceArtifacts = stripFenceArtifacts;
+  SA.liveStreamProse = liveStreamProse;
 }