fix task list on numbered list

Author: metiftikci

web_src/js/features/comp/EditorMarkdown.test.ts

@@ -20,8 +20,9 @@ test('EditorMarkdown', () => {
   testInput('1. ', '');
 
   testInput('- x', '- x\n- ');
+  testInput('1. foo', '1. foo\n2. ');
   testInput('- [ ]', '- [ ]\n- ');
   testInput('- [ ] foo', '- [ ] foo\n- [ ] ');
   testInput('* [x] foo', '* [x] foo\n* [ ] ');
-  testInput('1. [x] foo', '1. [x] foo\n1. [ ] ');
+  testInput('1. [x] foo', '1. [x] foo\n2. [ ] ');
 });

web_src/js/features/comp/EditorMarkdown.ts

@@ -97,7 +97,8 @@ function handleNewline(textarea: HTMLTextAreaElement, e: Event) {
     // start a new line with the same indention and prefix
     let newPrefix = prefix;
     // a simple approach, otherwise it needs to parse the lines after the current line
-    if (/^\d+\./.test(prefix)) newPrefix = `${Number(newPrefix.slice(0, newPrefix.indexOf('.'))) + 1}. `;
+    const numberedListMatch = /^(\d+)\.( \[[ x]\])? /.exec(prefix);
+    if (numberedListMatch) newPrefix = `${Number(numberedListMatch[1]) + 1}.${numberedListMatch[2] ?? ''} `;
     newPrefix = newPrefix.replace('[x]', '[ ]');
     const newLine = `\n${indention}${newPrefix}`;
     textarea.value = value.slice(0, selStart) + newLine + value.slice(selEnd);