setting icon_url and thread_ts together and executing PostMessage disables icon_url

[esakat]

What happend

I made the following code to change the avatar and username replying in Thread. but it was changed only username. avatar was still default of slack-app.

msgOption := slack.MsgOptionCompose(
    slack.MsgOptionTS(replyThreadTimestamp),
    slack.MsgOptionBroadcast(),
    slack.MsgOptionUsername("foouser"),
    slack.MsgOptionIconURL("https://some.png"),
    slack.MsgOptionText("test", true),
    slack.MsgOptionAsUser(false),
)

slack.New(config.BotToken).PostMessage(
    config.ChannelID,
    msgOption,
)

I noticed that the avatar would change if it wasn't a Thread reply. i.e. I comment out Msg OptionTS, it successed.

msgOption := slack.MsgOptionCompose(
    //slack.MsgOptionTS("replyThreadTimestamp"),
    slack.MsgOptionBroadcast(),
    slack.MsgOptionUsername("foouser"),
    slack.MsgOptionIconURL("https://some.png"),
    slack.MsgOptionText("test", true),
    slack.MsgOptionAsUser(false),
)

I also recognize it as a go-slack issue, because I've confirmed that using curl, I can change bot's avatar and reply with thread.

curl -XPOST -d "thread_ts=xxx.xxx" -d "token=xx" -d "channel=#xxx" -d "text=xxx" -d "username=xxxx" -d "icon_url=https://some.png" "https://slack.com/api/chat.postMessage"

Expected behavior

I expect to be able to change the avatar even in Thread replying

Steps to reproduce

it will be happen by creating an MsgOption that includes MsgOptionTS and MsgOptionIconURL together.

Versions

• Go: go version go1.15.6 darwin/amd64
• slack-go/slack: v0.8.2

[esakat]

I noticed, if i comment out slack.MsgOptionBroadcast() it succeed to change the avatar and username replying in thread.

msgOption := slack.MsgOptionCompose(
    slack.MsgOptionTS("replyThreadTimestamp"),
    //slack.MsgOptionBroadcast(),
    slack.MsgOptionUsername("foouser"),
    slack.MsgOptionIconURL("https://some.png"),
    slack.MsgOptionText("test", true),
    slack.MsgOptionAsUser(false),
)

but I want to use Broadcast with.

[kanata2]

Thank you for reporting. I'll confirm later.