Mattermost plugin to disable Show More/Show Less post truncation

com.boehs.no-show-more.tar.gz

main.js

var plugin = {
    initialize: function() {
        var style = document.createElement('style');
        style.id = 'no-show-more-plugin';
        style.textContent = [
            '/* Remove max-height on collapsed posts */',
            '.post-message--collapsed .post-message__text-container {',
            '    max-height: none !important;',
            '}',
            '/* Remove the gradient fade mask */',
            '.post-message--collapsed.post-message--overflow .post-message__text-container {',
            '    mask-image: none !important;',
            '    -webkit-mask-image: none !important;',
            '}',
            '/* Hide the Show More button and lines */',
            '.post-collapse__show-more,',
            '.post-attachment-collapse__show-more {',
            '    display: none !important;',
            '}',
            '/* Also handle sidebar card collapsed */',
            '.sidebar-right__card .post-message--collapsed {',
            '    max-height: none !important;',
            '}'
        ].join('\n');
        document.head.appendChild(style);
    },
    uninitialize: function() {
        var el = document.getElementById('no-show-more-plugin');
        if (el) el.remove();
    }
};

window.registerPlugin('com.boehs.no-show-more', plugin);

plugin.json

{
    "id": "com.boehs.no-show-more",
    "name": "No Show More",
    "description": "Disables the Show More/Show Less post truncation",
    "version": "1.0.1",
    "min_server_version": "9.0.0",
    "webapp": {
        "bundle_path": "webapp/dist/main.js"
    }
}

Mattermost "No Show More" Plugin

Mattermost truncates posts taller than 600px behind a "Show More" button. There's no setting to disable this. This webapp-only plugin injects CSS to remove the truncation.

Install

Download com.boehs.no-show-more.tar.gz from this gist, then upload it via System Console > Plugin Management and enable it.

For Docker/headless installs:

docker cp com.boehs.no-show-more.tar.gz mattermost:/tmp/
docker exec mattermost mmctl --local plugin add /tmp/com.boehs.no-show-more.tar.gz
docker exec mattermost mmctl --local plugin enable com.boehs.no-show-more

(EnableLocalMode: true required in config — see blog post for full details.)

Hard-refresh (Cmd+Shift+R) or restart the desktop app after installing.

Tested on Mattermost 11.3.0.