Fix footnote order in table cells

Related-to: mdx-js/mdx#1638.
Closes remarkjs/remark-gfm#35.

Author: wooorm

lib/handlers/table.js

@@ -24,13 +24,16 @@ export function table(h, node) {
   while (++index < rows.length) {
     const row = rows[index].children
     const name = index === 0 ? 'th' : 'td'
-    let pos = node.align ? align.length : row.length
     /** @type {Array.<Content>} */
     const out = []
+    let cellIndex = -1
+    const length = node.align ? align.length : row.length
 
-    while (pos--) {
-      const cell = row[pos]
-      out[pos] = h(cell, name, {align: align[pos]}, cell ? all(h, cell) : [])
+    while (++cellIndex < length) {
+      const cell = row[cellIndex]
+      out.push(
+        h(cell, name, {align: align[cellIndex]}, cell ? all(h, cell) : [])
+      )
     }
 
     result[index] = h(rows[index], 'tr', wrap(out, true))

test/footnote.js

@@ -375,6 +375,44 @@ test('Footnote', (t) => {
     'should render footnotes in tables'
   )
 
+  t.equal(
+    toHtml(
+      // @ts-expect-error: fine.
+      toHast(
+        fromMarkdown(
+          `| [^1] | [^2] |
+| ---- | ---- |
+
+[^1]: a
+[^2]: b`,
+          {
+            extensions: [gfm()],
+            mdastExtensions: [gfmFromMarkdown()]
+          }
+        )
+      )
+    ),
+    `<table>
+<thead>
+<tr>
+<th><sup><a href="#user-content-fn-1" id="user-content-fnref-1" data-footnote-ref aria-describedby="footnote-label">1</a></sup></th>
+<th><sup><a href="#user-content-fn-2" id="user-content-fnref-2" data-footnote-ref aria-describedby="footnote-label">2</a></sup></th>
+</tr>
+</thead>
+</table>
+<section data-footnotes class="footnotes"><h2 id="footnote-label" class="sr-only">Footnotes</h2>
+<ol>
+<li id="user-content-fn-1">
+<p>a <a href="#user-content-fnref-1" data-footnote-backref class="data-footnote-backref" aria-label="Back to content">↩</a></p>
+</li>
+<li id="user-content-fn-2">
+<p>b <a href="#user-content-fnref-2" data-footnote-backref class="data-footnote-backref" aria-label="Back to content">↩</a></p>
+</li>
+</ol>
+</section>`,
+    'should render footnotes in table cells'
+  )
+
   t.equal(
     toHtml(
       // @ts-expect-error: fine.