Cannot use command with channel option when md preview is disabled

[advaith1]

Description

When markdown preview is disabled in User Settings, you cannot use a command with a channel option. The channel selector shows but the pill has a red outline and errors when you try to send the command.

This issue was reported to me by a bot user who did not know why it was not working, and I can reproduce when I turn off markdown preview.

Steps to Reproduce

1. Turn off markdown preview in User Settings > Text & Images
2. Try to use a slash command with a channel option, such as Activities' /activity

Expected Behavior

The command works as normal

Current Behavior

You can select a channel, but the pill has a red outline and errors when you try to send the command

Screenshots/Videos

Client and System Information

Canary 152859 (25f375c) Host 1.0.49 Windows 10 64-Bit (10.0.25217)

[DV8FromTheWorld]

So in this screenshot you've mentioned #General but that's not a valid mention. Text channels cannot have capitals, so more likely this is a voice-channel mention of a General channel. The problem is that raw-input textbox (e.g: Markdown Preview disabled textbox) doesn't support non-text-channel-like mentions (#<name-here>). This means that you can't actually mention voice/stage channels (nor categories) with raw-input because raw-input changes the mention to #<name>.

So in the short term we will look at enabling markdown preview being enabled in channel slash command options to enable this functionality.

This need has been synced internally.

[advaith1]

Yeah, this command only accepts voice channels.

I looked into it more and it turns out that the name of the channel is irrelevant, it just fails for selecting any voice or stage channel.

Also, this issue affects standard voice/stage channel mentions in messages (by typing #!name and using the autocomplete), so it isn't just commands. However, I think the more urgent issue is the impact on commands.

[DV8FromTheWorld]

I looked into it more and it turns out that the name of the channel is irrelevant, it just fails for selecting any voice or stage channel.

I wasn't implying that the name casing or format was the problem. The problem is the mention syntax. The mention syntax of #<name> only supports resolving text-channel-like channels, like Text,News,Thread.

The mention syntax for Voice/Stage is #!<name> but you can see in your screenshot that it isn't correct.

[DV8FromTheWorld]

Also, this issue affects standard voice/stage channel mentions in messages (by typing #!name and using the autocomplete), so it isn't just commands.

The problem is that raw-input textbox (e.g: Markdown Preview disabled textbox) doesn't support non-text-channel-like mentions (#). This means that you can't actually mention voice/stage channels (nor categories) with raw-input because raw-input changes the mention to #.