#566 multiline text field when renaming single item

lib/widgets/dialogs/entry_editors/rename_entry_dialog.dart

@@ -42,22 +42,31 @@ class _RenameEntryDialogState extends State<RenameEntryDialog> {
 
   @override
   Widget build(BuildContext context) {
-    final isRtl = context.isRtl;
-    final extensionSuffixText = '${Unicode.FSI}${entry.extension}${Unicode.PDI}';
     return AvesDialog(
-      content: TextField(
+      content: Row(
+        crossAxisAlignment: CrossAxisAlignment.end,
+        children: [
+          Expanded(
+            child: TextField(
               controller: _nameController,
               decoration: InputDecoration(
                 labelText: context.l10n.renameEntryDialogLabel,
-          // decoration prefix and suffix follow directionality
-          // but the file extension should always be on the right
-          prefixText: isRtl ? extensionSuffixText : null,
-          suffixText: isRtl ? null : extensionSuffixText,
               ),
               autofocus: true,
+              maxLines: null,
               onChanged: (_) => _validate(),
               onSubmitted: (_) => _submit(context),
             ),
+          ),
+          Padding(
+            padding: const EdgeInsetsDirectional.only(start: 4, bottom: 12),
+            child: Text(
+              '${Unicode.FSI}${entry.extension}${Unicode.PDI}',
+              style: TextStyle(color: Theme.of(context).hintColor),
+            ),
+          ),
+        ],
+      ),
       actions: [
         const CancelButton(),
         ValueListenableBuilder<bool>(
@@ -78,7 +87,7 @@ class _RenameEntryDialogState extends State<RenameEntryDialog> {
     return pContext.join(entry.directory!, '$name${entry.extension}');
   }
 
-  String get newName => _nameController.text.trimLeft();
+  String get newName => _nameController.text.trimLeft().replaceAll('\n', '');
 
   Future<void> _validate() async {
     final _newName = newName;