Fix mention coloring

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/adapters/messages/MagicIncomingTextMessageViewHolder.java

@@ -155,7 +155,8 @@ public class MagicIncomingTextMessageViewHolder
                                     .nc_incoming_text_mention_others);
                         }
 
-                        messageString = DisplayUtils.searchAndColor(message.getText(), "@" + individualHashMap.get("name"), color);
+                        messageString = DisplayUtils.searchAndColor(messageString,
+                                "@" + individualHashMap.get("name"), color);
                     } else if (individualHashMap.get("type").equals("file")) {
                         itemView.setOnClickListener(v -> {
                             Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(individualHashMap.get("link")));

app/src/main/java/com/nextcloud/talk/adapters/messages/MagicOutcomingTextMessageViewHolder.java

@@ -92,7 +92,7 @@ public class MagicOutcomingTextMessageViewHolder extends MessageHolders.Outcomin
                     if (individualHashMap.get("type").equals("user") || individualHashMap.get("type").equals("guest") || individualHashMap.get("type").equals("call")) {
                         if (!individualHashMap.get("id").equals(message.getActiveUserId())) {
                             messageString =
-                                    DisplayUtils.searchAndColor(message.getText(),
+                                    DisplayUtils.searchAndColor(messageString,
                                             "@" + individualHashMap.get("name"), NextcloudTalkApplication
                                             .getSharedApplication().getResources().getColor(R.color.nc_outcoming_text_default));
                         }

app/src/main/java/com/nextcloud/talk/adapters/messages/MagicSystemMessageViewHolder.java

@@ -68,7 +68,8 @@ public class MagicSystemMessageViewHolder extends MessageHolders.IncomingTextMes
                     }
 
                     messageString =
-                            DisplayUtils.searchAndColor(message.getText(), "@" + individualHashMap.get("name"), color);
+                            DisplayUtils.searchAndColor(messageString,
+                                    "@" + individualHashMap.get("name"), color);
                 }
             }
         }

app/src/main/java/com/nextcloud/talk/utils/DisplayUtils.java

@@ -209,10 +209,10 @@ public class DisplayUtils {
     }
 
 
-    public static Spannable searchAndColor(String text, String searchText, @ColorInt int color) {
+    public static Spannable searchAndColor(Spannable text, String searchText, @ColorInt int color) {
 
         Spannable spannableString = new SpannableString(text);
-
+        String stringText = text.toString();
         if (TextUtils.isEmpty(text) || TextUtils.isEmpty(searchText)) {
             return spannableString;
         }
@@ -227,7 +227,7 @@ public class DisplayUtils {
 
         int lastStartIndex = -1;
         while (m.find()) {
-            int start = text.indexOf(m.group(), lastStartIndex);
+            int start = stringText.indexOf(m.group(), lastStartIndex);
             int end = start + m.group().length();
             lastStartIndex = end;
             spannableString.setSpan(new ForegroundColorSpan(color), start, end,