remove list item if empty + enter pressed

lib/markdown_formatter.dart

@@ -40,6 +40,19 @@ extension on TextEditingValue {
       ),
     );
   }
+
+  /// cuts [characterCount] number of chars from before the cursor
+  TextEditingValue trimBeforeCursor(int characterCount) {
+    final beg = text.substring(0, selection.baseOffset);
+    final end = text.substring(selection.baseOffset);
+
+    return copyWith(
+        text: beg.substring(0, beg.length - characterCount - 1) + end,
+        selection: selection.copyWith(
+          baseOffset: selection.baseOffset - characterCount,
+          extentOffset: selection.extentOffset - characterCount,
+        ));
+  }
 }
 
 /// Provides convenience formatting in markdown text fields
@@ -59,27 +72,43 @@ class MarkdownFormatter extends TextInputFormatter {
 
       TextEditingValue unorderedListContinuation(
           String listChar, TextEditingValue tev) {
-        final regex = RegExp(r'(\s*)' '${RegExp.escape(listChar)} ');
+        final regex = RegExp(r'(\s*)' '${RegExp.escape(listChar)} (.*)');
         final match = regex.matchAsPrefix(lineBefore);
+
         if (match == null) {
           return tev;
         }
+
+        final listItemBody = match.group(2);
         final indent = match.group(1);
 
+        if (listItemBody == null || listItemBody.isEmpty) {
+          return tev.trimBeforeCursor(listChar.length + (indent?.length ?? 1));
+        }
+
         return tev.append('$indent$listChar ');
       }
 
       TextEditingValue orderedListContinuation(
           String afterNumberChar, TextEditingValue tev) {
         final regex =
-            RegExp(r'(\s*)(\d+)' '${RegExp.escape(afterNumberChar)} ');
+            RegExp(r'(\s*)(\d+)' '${RegExp.escape(afterNumberChar)} (.*)');
         final match = regex.matchAsPrefix(lineBefore);
+
         if (match == null) {
           return tev;
         }
-        final indent = match.group(1);
-        final number = int.tryParse(match.group(2)!) ?? 0 + 1;
 
+        final listItemBody = match.group(3)!;
+        final indent = match.group(1)!;
+        final numberStr = match.group(2)!;
+
+        if (listItemBody.isEmpty) {
+          return tev.trimBeforeCursor(
+              indent.length + numberStr.length + afterNumberChar.length + 1);
+        }
+
+        final number = (int.tryParse(match.group(2)!) ?? 0) + 1;
         return tev.append('$indent$number$afterNumberChar ');
       }