[WAHA] Add poll meta attrs in sendNewsletter

Author: devlikepro

send.go

@@ -670,10 +670,32 @@ func (cli *Client) sendNewsletter(
 			plaintextNode.Attrs["mediatype"] = mediaType
 		}
 	}
+	content := []waBinary.Node{}
+	if attrs["type"] == "poll" {
+		var node waBinary.Node
+		if message.PollUpdateMessage == nil {
+			node = waBinary.Node{
+				Tag: "meta",
+				Attrs: waBinary.Attrs{
+					"polltype":    "creation",
+					"contenttype": "text",
+				},
+			}
+		} else {
+			node = waBinary.Node{
+				Tag: "meta",
+				Attrs: waBinary.Attrs{
+					"polltype": "vote",
+				},
+			}
+		}
+		content = append(content, node)
+	}
+	content = append(content, plaintextNode)
 	node := waBinary.Node{
 		Tag:     "message",
 		Attrs:   attrs,
-		Content: []waBinary.Node{plaintextNode},
+		Content: content,
 	}
 	start = time.Now()
 	data, err := cli.sendNodeAndGetData(node)