fix: Properly handle url encoding in matrix.to URLs

lib/utils/matrix_identifier_string_extension.dart

@@ -1,24 +1,33 @@
+import '../app_config.dart';
+
 extension MatrixIdentifierStringExtension on String {
   /// Separates room identifiers with an event id and possibly a query parameter into its components.
   MatrixIdentifierStringExtensionResults parseIdentifierIntoParts() {
-    final match = RegExp(r'^([#!][^:]*:[^\/?]*)(?:\/(\$[^?]*))?(?:\?(.*))?$')
-        .firstMatch(this);
+    final isUrl = startsWith(AppConfig.inviteLinkPrefix);
+    var s = this;
+    if (isUrl) {
+      // as we decode a component we may only call it on the url part *before* the "query" part
+      final parts = replaceFirst(AppConfig.inviteLinkPrefix, '').split('?');
+      s = Uri.decodeComponent(parts.removeAt(0)) + '?' + parts.join('?');
+    }
+    final match = RegExp(r'^([#!@+][^:]*:[^\/?]*)(?:\/(\$[^?]*))?(?:\?(.*))?$')
+        .firstMatch(s);
     if (match == null) {
       return null;
     }
     return MatrixIdentifierStringExtensionResults(
-      roomIdOrAlias: match.group(1),
-      eventId: match.group(2),
-      queryString: match.group(3),
+      primaryIdentifier: match.group(1),
+      secondaryIdentifier: match.group(2),
+      queryString: match.group(3)?.isNotEmpty ?? false ? match.group(3) : null,
     );
   }
 }
 
 class MatrixIdentifierStringExtensionResults {
-  final String roomIdOrAlias;
-  final String eventId;
+  final String primaryIdentifier;
+  final String secondaryIdentifier;
   final String queryString;
 
   MatrixIdentifierStringExtensionResults(
-      {this.roomIdOrAlias, this.eventId, this.queryString});
+      {this.primaryIdentifier, this.secondaryIdentifier, this.queryString});
 }