Make the ACL update message less noisy

Fixes element-hq/element-web#14216

Copy is not reviewed as of writing.

Author: turt2live

src/TextForEvent.js

@@ -198,59 +198,30 @@ function textForRelatedGroupsEvent(ev) {
 function textForServerACLEvent(ev) {
     const senderDisplayName = ev.sender && ev.sender.name ? ev.sender.name : ev.getSender();
     const prevContent = ev.getPrevContent();
-    const changes = [];
     const current = ev.getContent();
     const prev = {
         deny: Array.isArray(prevContent.deny) ? prevContent.deny : [],
         allow: Array.isArray(prevContent.allow) ? prevContent.allow : [],
         allow_ip_literals: !(prevContent.allow_ip_literals === false),
     };
+
     let text = "";
     if (prev.deny.length === 0 && prev.allow.length === 0) {
-        text = `${senderDisplayName} set server ACLs for this room: `;
+        text = `${senderDisplayName} set server ACLs for this room. `;
     } else {
-        text = `${senderDisplayName} changed the server ACLs for this room: `;
+        text = `${senderDisplayName} changed the server ACLs for this room. `;
     }
 
     if (!Array.isArray(current.allow)) {
         current.allow = [];
     }
-    /* If we know for sure everyone is banned, don't bother showing the diff view */
+
+    // If we know for sure everyone is banned, mark the room as obliterated
     if (current.allow.length === 0) {
         return text + "🎉 All servers are banned from participating! This room can no longer be used.";
     }
 
-    if (!Array.isArray(current.deny)) {
-        current.deny = [];
-    }
-
-    const bannedServers = current.deny.filter((srv) => typeof(srv) === 'string' && !prev.deny.includes(srv));
-    const unbannedServers = prev.deny.filter((srv) => typeof(srv) === 'string' && !current.deny.includes(srv));
-    const allowedServers = current.allow.filter((srv) => typeof(srv) === 'string' && !prev.allow.includes(srv));
-    const unallowedServers = prev.allow.filter((srv) => typeof(srv) === 'string' && !current.allow.includes(srv));
-
-    if (bannedServers.length > 0) {
-        changes.push(`Servers matching ${bannedServers.join(", ")} are now banned.`);
-    }
-
-    if (unbannedServers.length > 0) {
-        changes.push(`Servers matching ${unbannedServers.join(", ")} were removed from the ban list.`);
-    }
-
-    if (allowedServers.length > 0) {
-        changes.push(`Servers matching ${allowedServers.join(", ")} are now allowed.`);
-    }
-
-    if (unallowedServers.length > 0) {
-        changes.push(`Servers matching ${unallowedServers.join(", ")} were removed from the allowed list.`);
-    }
-
-    if (prev.allow_ip_literals !== current.allow_ip_literals) {
-        const allowban = current.allow_ip_literals ? "allowed" : "banned";
-        changes.push(`Participating from a server using an IP literal hostname is now ${allowban}.`);
-    }
-
-    return text + changes.join(" ");
+    return text.trim();
 }
 
 function textForMessageEvent(ev) {