Refactoring

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -2396,7 +2396,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             ssb.setSpan(new ForegroundColorSpan(textColorLink), start, ssb.length(), 0);
                         }
                     } else {
-                        personal = Helper.transformMathematical(personal);
                         if (full) {
                             ssb.append(personal).append(" <");
                             if (!TextUtils.isEmpty(email)) {

app/src/main/java/eu/faircode/email/Helper.java

@@ -2166,47 +2166,6 @@ public class Helper {
         return value;
     }
 
-    static String transformMathematical(String value) {
-        if (!BuildConfig.DEBUG)
-            return value;
-
-        // https://www.w3.org/TR/xml-entity-names/1D4.html
-        // https://www.utf8-chartable.de/unicode-utf8-table.pl?start=119808
-
-        StringBuilder sb = new StringBuilder();
-
-        int k = 0;
-        while (k < value.length()) {
-            int cp = value.codePointAt(k);
-
-            if (cp >= 0x1D400 && cp <= 0x1D419) // MATHEMATICAL BOLD CAPITAL A-Z
-                sb.append((char) (cp - 0x1D400 + 65));
-            else if (cp >= 0x1D41A && cp <= 0x1D433) // MATHEMATICAL BOLD SMALL A-Z
-                sb.append((char) (cp - 0x1D41A + 97));
-            else if (cp >= 0x1D434 && cp <= 0x1D44D) // MATHEMATICAL ITALIC CAPITAL A-Z
-                sb.append((char) (cp - 0x1D434 + 65));
-            else if (cp >= 0x1D44E && cp <= 0x1D467) // MATHEMATICAL ITALIC SMALL A-Z
-                sb.append((char) (cp - 0x1D44E + 97));
-            else if (cp >= 0x1D468 && cp <= 0x1D481) // MATHEMATICAL BOLD ITALIC CAPITAL A-Z
-                sb.append((char) (cp - 0x1D468 + 65));
-            else if (cp >= 0x1D482 && cp <= 0x1D49B) // MATHEMATICAL BOLD ITALIC SMALL A-Z
-                sb.append((char) (cp - 0x1D482 + 97));
-            else if (cp >= 0x1D49C && cp <= 0x1D4B5) // MATHEMATICAL SCRIPT CAPITAL A-Z
-                sb.append((char) (cp - 0x1D49C + 65));
-            else if (cp >= 0x1D4B6 && cp <= 0x1D4CF) // MATHEMATICAL SCRIPT SMALL A-Z
-                sb.append((char) (cp - 0x1D4B6 + 97));
-            else if (cp >= 0x1D4D0 && cp <= 0x1D4E9) // MATHEMATICAL BOLD SCRIPT CAPITAL A-Z
-                sb.append((char) (cp - 0x1D4D0 + 65));
-            else if (cp >= 0x1D4EA && cp <= 0x1D4FF) // MATHEMATICAL BOLD SCRIPT SMALL A-Z
-                sb.append((char) (cp - 0x1D4EA + 97));
-            else
-                sb.appendCodePoint(cp);
-
-            k += Character.charCount(cp);
-        }
-        return sb.toString();
-    }
-
     // Files
 
     static {

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -2796,8 +2796,7 @@ public class MessageHelper {
                             }
                         if (quote)
                             personal = "\"" + personal + "\"";
-                    } else
-                        personal = Helper.transformMathematical(personal);
+                    }
 
                     if (format == AddressFormat.NAME_EMAIL && !TextUtils.isEmpty(email))
                         formatted.add(personal + " <" + email + ">");
@@ -4643,6 +4642,47 @@ public class MessageHelper {
         return email;
     }
 
+    static String sanitizeName(String name) {
+        if (!BuildConfig.DEBUG)
+            return name;
+
+        // https://www.w3.org/TR/xml-entity-names/1D4.html
+        // https://www.utf8-chartable.de/unicode-utf8-table.pl?start=119808
+
+        StringBuilder sb = new StringBuilder();
+
+        int k = 0;
+        while (k < name.length()) {
+            int cp = name.codePointAt(k);
+
+            if (cp >= 0x1D400 && cp <= 0x1D419) // MATHEMATICAL BOLD CAPITAL A-Z
+                sb.append((char) (cp - 0x1D400 + 65));
+            else if (cp >= 0x1D41A && cp <= 0x1D433) // MATHEMATICAL BOLD SMALL A-Z
+                sb.append((char) (cp - 0x1D41A + 97));
+            else if (cp >= 0x1D434 && cp <= 0x1D44D) // MATHEMATICAL ITALIC CAPITAL A-Z
+                sb.append((char) (cp - 0x1D434 + 65));
+            else if (cp >= 0x1D44E && cp <= 0x1D467) // MATHEMATICAL ITALIC SMALL A-Z
+                sb.append((char) (cp - 0x1D44E + 97));
+            else if (cp >= 0x1D468 && cp <= 0x1D481) // MATHEMATICAL BOLD ITALIC CAPITAL A-Z
+                sb.append((char) (cp - 0x1D468 + 65));
+            else if (cp >= 0x1D482 && cp <= 0x1D49B) // MATHEMATICAL BOLD ITALIC SMALL A-Z
+                sb.append((char) (cp - 0x1D482 + 97));
+            else if (cp >= 0x1D49C && cp <= 0x1D4B5) // MATHEMATICAL SCRIPT CAPITAL A-Z
+                sb.append((char) (cp - 0x1D49C + 65));
+            else if (cp >= 0x1D4B6 && cp <= 0x1D4CF) // MATHEMATICAL SCRIPT SMALL A-Z
+                sb.append((char) (cp - 0x1D4B6 + 97));
+            else if (cp >= 0x1D4D0 && cp <= 0x1D4E9) // MATHEMATICAL BOLD SCRIPT CAPITAL A-Z
+                sb.append((char) (cp - 0x1D4D0 + 65));
+            else if (cp >= 0x1D4EA && cp <= 0x1D4FF) // MATHEMATICAL BOLD SCRIPT SMALL A-Z
+                sb.append((char) (cp - 0x1D4EA + 97));
+            else
+                sb.appendCodePoint(cp);
+
+            k += Character.charCount(cp);
+        }
+        return sb.toString();
+    }
+
     static InternetAddress[] parseAddresses(Context context, String text) throws AddressException {
         if (TextUtils.isEmpty(text))
             return null;