Fixed mentions.

src/snek/static/chat-input.js

@@ -70,9 +70,14 @@ class ChatInputComponent extends HTMLElement {
   return mentions.map(mention => {
     let closestAuthor = null;
     let minDistance = Infinity;
-
+     const lowerMention = mention.toLowerCase();
+    
     authors.forEach(author => {
-      const distance = this.levenshteinDistance(mention.toLowerCase(), author.toLowerCase());
+    const lowerAuthor = author.toLowerCase();
+      const distance = this.levenshteinDistance(lowerMention, lowerAuthor);
+        if(!this.isSubSequence(lowerMention,lowerAuthor)) {
+            distance += 1        
+        }
       if (distance < minDistance) {
         minDistance = distance;
         closestAuthor = author;
@@ -252,6 +257,25 @@ levenshteinDistance(a, b) {
     const millisecondsDifference = event2Time.getTime() - event1Time.getTime();
     return millisecondsDifference / 1000;
   }
+  isSubsequence(input, array) {
+      for (const str of array) {
+        let i = 0; 
+        let j = 0; 
+
+        while (i < input.length && j < str.length) {
+          if (input[i] === str[j]) {
+            i++;
+          }
+          j++;
+        }
+
+        if (i === input.length) {
+          return true;
+        }
+      }
+      return false; 
+    }
+
 
   newMessage() {
     if (!this.messageUid) {