muse-chat-api.py: cdp_call skips CDP event chatter

bin/muse-chat-api.py

@@ -265,14 +265,20 @@ def cmd_sidechat_create(ws):
 
 def cdp_call(ws, method, params=None):
     """Raw CDP method call for non-Runtime domains (DOM, Page, ...).
-    The ev() helper only speaks Runtime.evaluate; uploads need DOM."""
+    The ev() helper only speaks Runtime.evaluate; uploads need DOM.
+    Skips CDP event chatter (messages without our id) while waiting."""
     cdp_call.counter += 1
-    ws.send(json.dumps({"id": cdp_call.counter, "method": method,
+    cid = cdp_call.counter
+    ws.send(json.dumps({"id": cid, "method": method,
                         "params": params or {}}))
+    for _ in range(20):
         resp = json.loads(ws.recv())
+        if resp.get("id") != cid:
+            continue  # event, not our response
         if "error" in resp:
             raise RuntimeError("CDP %s failed: %s" % (method, resp["error"]))
         return resp.get("result", {})
+    raise RuntimeError("CDP %s: no response after 20 reads" % method)
 
 
 cdp_call.counter = 100