Fix Discord / discord.com to use an aligned xchat/hexchat-like nick gutter. Gives an irc like feeling to compact mode

dircord.user.css

/* ==UserStyle==
@name        ircord
@description Discord: use xchat-like aligned nick gutter. Gives an irc like feeling to compact & cozy mode
@namespace   discord.com
@version     4.1.1
@author      anakojm
@license     CC0
==/UserStyle== */
[class*="messageListItem"] > [class*="message"] > [class*="contents"] > [class*="header"],
/* First message of a thread */
[class*="quotedChatMessage"] > [class*="message"] > [class*="contents"] > [class*="header"],
/* Username when a file is uploading */
[class*="scrollerInner"] > [class*="wrapper"] > [class*="contents"] > [class*="header"] {
        display: inline-block;
        text-align: right;
        width: 21.3em;
        overflow: hidden;
        white-space: nowrap;
}

[class*="messageListItem"] > [class*="message"] > [class*="container"],
[class*="messageListItem"] > [class*="message"] > [class*="contents"] > div,
[class*="quotedChatMessage"] > [class*="message"] > [class*="container"],
[class*="quotedChatMessage"] > [class*="message"] > [class*="contents"] > div,
/* Thread line on multiline message */
[class*="messageListItem"] > [class*="message"] > [class*="contents"]:before,
/* File upload progress */
[class*="scrollerInner"] > [class*="wrapper"] > [class*="contents"] > [class*="messageContent"] > [class*="attachment"],
#chat-messages-create-thread-null-create-thread-null + [class*="message"] > [class*="contents"] > [class*="messageContent"] {
        margin-left: 17.6em;
}
/* To align properly the bar later */
[class*="messageListItem"] > [class*="message"] > [class*="repliedMessage"],
[class*="quotedChatMessage"] > [class*="message"] > [class*="repliedMessage"] {
        margin-left: 20.12em;
}

[class*="messageListItem"] > [class*="message"] > [class*="contents"] > [class*="messageContent"],
[class*="quotedChatMessage"] > [class*="message"] > [class*="contents"] > [class*="messageContent"],
#chat-messages-create-thread-null-create-thread-null + [class*="message"] > [class*="contents"] > [class*="messageContent"] {
        display: flow;
}
/* system messages don’t have usernames */
[class*="messageListItem"] > [class*="compact"]:not([class*="systemMessage"]) > [class*="contents"] > [class*="messageContent"],
[class*="quotedChatMessage"] > [class*="compact"] > [class*="contents"] > [class*="messageContent"],
[class*="messageListItem"] > [class*="compact"] > [class*="contents"] > div:not([class*="markup"]),
[class*="quotedChatMessage"] > [class*="compact"] > [class*="contents"] > div:not([class*="markup"]),
#chat-messages-create-thread-null-create-thread-null + [class*="message"] > [class*="contents"] > [class*="messageContent"] {
        /* dirty workaround but i got nothing better */
        margin-top: -1.58em;
}

/* discord puts that at -4 chr, which is normally cool, but
   with the way we do things it hides system messages icons */
[class*="messageContent"] > [class*="container"] {
        margin-left: initial;
}


[class*="messageListItem"] > [class*="message"] > [class*="container"],
[class*="messageListItem"] > [class*="message"] > [class*="contents"] > div,
[class*="quotedChatMessage"] > [class*="message"] > [class*="container"],
[class*="quotedChatMessage"] > [class*="message"] > [class*="contents"] > div,
[class*="quotedChatMessage"] > [class*="message"] > [class*="repliedMessage"],
[class*="messageListItem"] > [class*="message"] > [class*="repliedMessage"],
#chat-messages-create-thread-null-create-thread-null + [class*="message"] > [class*="contents"] > [class*="messageContent"] {
        /* for symmetry around the bar */
        padding-left: 0.6em;
        border-left: 1px solid var(--primary-400);
}
/* forum post */
[class*="scrollerInner"] > [class*="container"] > [class*="reactButtons"] {
        width: 21.6em;
        height: 2.1em;
        border-right: 1px solid var(--primary-400);
}

/* remove padding and margin to make the bar contiguous */
[class*="messageListItem"] > [class*="message"],
[class*="quotedChatMessage"] > [class*="message"],
[class*="scrollerInner"] > [class*="container"],
[class*="messageListItem"] + [class*="container"] + [class*="divider"] {
        padding-top: 0;
        padding-bottom: 0;
        margin-top: 0;
        margin-bottom: 0;
}
[class*="messageListItem"] > [class*="message"] > [class*="contents"] > div > [class*="channelTextArea"],
[class*="quotedChatMessage"] > [class*="message"] > [class*="contents"] > div > [class*="channelTextArea"] {
        margin-top: 0;
        /* original margin-top, we transfer it to padding for the bar */
        padding-top: 8px;
}


/* Why does discord show a cozy styled pfp when uploading in compact mode???
   oh yeah they’re incompetent */
[class*="scrollerInner"] > [class*="wrapper"] > [class*="contents"] > [class*="avatar"] {
        display: none;
}



/* Cozy mode */
[class*="messageListItem"] > [class*="cozy"] > [class*="contents"] > [class*="avatar"],
[class*="quotedChatMessage"] > [class*="cozy"] > [class*="contents"] > [class*="avatar"] {
        /* 1em² is the size of avatars in compact mode with show avatars */
        width: 1em;
        height: 1em;
}
[class*="messageListItem"] > [class*="cozy"] > [class*="contents"] > [class*="header"],
[class*="quotedChatMessage"] > [class*="cozy"] > [class*="contents"] > [class*="header"] {
        display: inline-block;
        text-align: right;
        width: 17.1em;
        overflow: hidden;
        white-space: nowrap;
}
[class*="cozyMessage"][class*="groupStart"] {
        min-height: initial;
}
[class*="hasThread"]:after {
        margin-left: 17.6em;
        margin-top: -28px;
}

#chat-messages-create-thread-null-create-thread-null + [class*="cozy"] > [class*="contents"] > [class*="messageContent"] {
        margin-left: 22.3em;
}

[class*="repliedMessage"] {
        margin-bottom: 0!important;
        padding-bottom: var(--reply-spacing);
}
[class*="messageListItem"] > [class*="cozy"][class*="groupStart"]:not([class*="systemMessage"]) > [class*="contents"] > [class*="messageContent"],
[class*="quotedChatMessage"] > [class*="cozy"] > [class*="contents"] > [class*="messageContent"],
[class*="messageListItem"] > [class*="cozy"][class*="groupStart"] > [class*="contents"] > div:not([class*="markup"]),
[class*="quotedChatMessage"] > [class*="cozy"] > [class*="contents"] > div:not([class*="markup"]) {
        /* dirty workaround but i got nothing better */
        margin-top: -1.58em;
}
[class*="cozyMessage"] > [class*="content"] > [class*="messageContent"] > [class*="container"] {
        margin-left: 4ch;
}
/* fix forum react bar */
[class*="scrollerInner"]:has(> [class*="messageListItem"] > [class*="cozyMessage"]) > [class*="container"] {
        padding-left: 8px;
}

[class*="backgroundFlash"][class*="groupStart"] {
        margin-top: initial;
}
#---new-messages-bar:not(:has(> [class*="content"])):has(+ [class*="messageListItem"] > [class*="cozy"]) {
        margin-bottom: initial;
        margin-top: initial;
        top: initial;
}

you can add that to have <username> instead of username

[class*="username"]:before {content: '<';}
[class*="username"]:after {content: '>';}
[class*="username"] > [class*="username"]:before,
[class*="username"] > [class*="username"]:after,
[class*="usernameSection"]:before,
[class*="usernameSection"]:after {content: initial;}