bug #30911 [Console] Fix table trailing backslash (maidmaid)

This PR was merged into the 4.2 branch.

Discussion
----------

[Console] Fix table trailing backslash

| Q             | A
| ------------- | ---
| Branch?       | 4.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30725
| License       | MIT
| Doc PR        | /

```php
(new Table($output))
    ->setColumnMaxWidth(0, 5)
    ->setRows([['1234\6']])
    ->render();
;
```
before:

```
+-------+
| 1234<fg=default;bg=default> |
| 6     |
+-------+
```

after:

```
+-------+
| 1234\ |
| 6     |
+-------+
```

#EUFOSSA

Commits
-------

48f020f Fix table trailing backslash

src/Symfony/Component/Console/Helper/Table.php

@@ -13,6 +13,7 @@
 
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Exception\RuntimeException;
+use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Formatter\WrappableOutputFormatterInterface;
 use Symfony\Component\Console\Output\ConsoleSectionOutput;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -528,6 +529,8 @@ private function buildTableRows($rows)
                 if (!strstr($cell, "\n")) {
                     continue;
                 }
+                $escaped = implode("\n", array_map([OutputFormatter::class, 'escapeTrailingBackslash'], explode("\n", $cell)));
+                $cell = $cell instanceof TableCell ? new TableCell($escaped, ['colspan' => $cell->getColspan()]) : $escaped;
                 $lines = explode("\n", str_replace("\n", "<fg=default;bg=default>\n</>", $cell));
                 foreach ($lines as $lineKey => $line) {
                     if ($cell instanceof TableCell) {

src/Symfony/Component/Console/Tests/Helper/TableTest.php

@@ -1072,6 +1072,26 @@ public function testColumnMaxWidths()
 |               | ities |            |                 |
 +---------------+-------+------------+-----------------+
 
+TABLE;
+
+        $this->assertEquals($expected, $this->getOutputContent($output));
+    }
+
+    public function testColumnMaxWidthsWithTrailingBackslash()
+    {
+        (new Table($output = $this->getOutputStream()))
+            ->setColumnMaxWidth(0, 5)
+            ->setRows([['1234\6']])
+            ->render()
+        ;
+
+        $expected =
+            <<<'TABLE'
++-------+
+| 1234\ |
+| 6     |
++-------+
+
 TABLE;
 
         $this->assertEquals($expected, $this->getOutputContent($output));