group non-letters in "#" group, display keys with only an address in-order

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/FlexibleKeyItemFactory.java

@@ -58,6 +58,15 @@ public class FlexibleKeyItemFactory {
     @NonNull
     private String getHeaderText(UnifiedKeyInfo unifiedKeyInfo) {
         String headerText = unifiedKeyInfo.name();
-        return headerText == null || headerText.isEmpty() ? "" : headerText.substring(0, 1).toUpperCase();
+        if (headerText == null || headerText.isEmpty()) {
+            headerText = unifiedKeyInfo.email();
+        }
+        if (headerText == null || headerText.isEmpty()) {
+            return "";
+        }
+        if (!Character.isLetter(headerText.codePointAt(0))) {
+            return "#";
+        }
+        return headerText.substring(0, 1).toUpperCase();
     }
 }

OpenKeychain/src/main/sqldelight/org/sufficientlysecure/keychain/Keys.sq

@@ -42,7 +42,7 @@ CREATE VIEW unifiedKeyView AS
 
 selectAllUnifiedKeyInfo:
 SELECT * FROM unifiedKeyView
-    ORDER BY has_any_secret_int DESC, name COLLATE NOCASE ASC, creation DESC;
+    ORDER BY has_any_secret_int DESC, IFNULL(name, email) COLLATE NOCASE ASC, creation DESC;
 
 selectUnifiedKeyInfoByMasterKeyId:
 SELECT * FROM unifiedKeyView