New task list items should always be unchecked

app/assets/javascripts/lib/utils/text_markdown.js

@@ -9,7 +9,7 @@ const LINK_TAG_PATTERN = '[{text}](url)';
 // a bullet point character (*+-) and an optional checkbox ([ ] [x])
 // OR a number with a . after it and an optional checkbox ([ ] [x])
 // followed by one or more whitespace characters
-const LIST_LINE_HEAD_PATTERN = /^(?<indent>\s*)(?<leader>((?<isUl>[*+-])|(?<isOl>\d+\.))( \[([x ])\])?\s)(?<content>.)?/;
+const LIST_LINE_HEAD_PATTERN = /^(?<indent>\s*)(?<leader>((?<isUl>[*+-])|(?<isOl>\d+\.))( \[([xX ])\])?\s)(?<content>.)?/;
 
 function selectedText(text, textarea) {
   return text.substring(textarea.selectionStart, textarea.selectionEnd);
@@ -391,6 +391,8 @@ function handleContinueList(e, textArea) {
       itemToInsert = `${indent}${leader}`;
     }
 
+    itemToInsert = itemToInsert.replace(/\[x\]/i, '[ ]');
+
     e.preventDefault();
 
     updateText({

spec/frontend/lib/utils/text_markdown_spec.js

@@ -179,11 +179,13 @@ describe('init markdown', () => {
           text                           | expected
           ${'- item'}                    | ${'- item\n- '}
           ${'- [ ] item'}                | ${'- [ ] item\n- [ ] '}
-          ${'- [x] item'}                | ${'- [x] item\n- [x] '}
+          ${'- [x] item'}                | ${'- [x] item\n- [ ] '}
+          ${'- [X] item'}                | ${'- [X] item\n- [ ] '}
           ${'- item\n  - second'}        | ${'- item\n  - second\n  - '}
           ${'1. item'}                   | ${'1. item\n2. '}
           ${'1. [ ] item'}               | ${'1. [ ] item\n2. [ ] '}
-          ${'1. [x] item'}               | ${'1. [x] item\n2. [x] '}
+          ${'1. [x] item'}               | ${'1. [x] item\n2. [ ] '}
+          ${'1. [X] item'}               | ${'1. [X] item\n2. [ ] '}
           ${'108. item'}                 | ${'108. item\n109. '}
           ${'108. item\n     - second'}  | ${'108. item\n     - second\n     - '}
           ${'108. item\n     1. second'} | ${'108. item\n     1. second\n     2. '}
@@ -207,10 +209,12 @@ describe('init markdown', () => {
           ${'- item\n- '}                          | ${'- item\n'}
           ${'- [ ] item\n- [ ] '}                  | ${'- [ ] item\n'}
           ${'- [x] item\n- [x] '}                  | ${'- [x] item\n'}
+          ${'- [X] item\n- [X] '}                  | ${'- [X] item\n'}
           ${'- item\n  - second\n  - '}            | ${'- item\n  - second\n'}
           ${'1. item\n2. '}                        | ${'1. item\n'}
           ${'1. [ ] item\n2. [ ] '}                | ${'1. [ ] item\n'}
           ${'1. [x] item\n2. [x] '}                | ${'1. [x] item\n'}
+          ${'1. [X] item\n2. [X] '}                | ${'1. [X] item\n'}
           ${'108. item\n109. '}                    | ${'108. item\n'}
           ${'108. item\n     - second\n     - '}   | ${'108. item\n     - second\n'}
           ${'108. item\n     1. second\n     1. '} | ${'108. item\n     1. second\n'}