diff --git a/Application.php b/Application.php
index 09234f5eb..5a2323db6 100644
--- a/Application.php
+++ b/Application.php
@@ -953,6 +953,16 @@ protected function doRunCommand(Command $command, InputInterface $input, OutputI
                 throw new RuntimeException('Unable to subscribe to signal events. Make sure that the `pcntl` extension is installed and that "pcntl_*" functions are not disabled by your php.ini\'s "disable_functions" directive.');
             }
 
+            if (Terminal::hasSttyAvailable()) {
+                $sttyMode = shell_exec('stty -g');
+
+                foreach ([\SIGINT, \SIGTERM] as $signal) {
+                    $this->signalRegistry->register($signal, static function () use ($sttyMode) {
+                        shell_exec('stty '.$sttyMode);
+                    });
+                }
+            }
+
             if ($this->dispatcher) {
                 foreach ($this->signalsToDispatchEvent as $signal) {
                     $event = new ConsoleSignalEvent($command, $input, $output, $signal);
diff --git a/Formatter/OutputFormatter.php b/Formatter/OutputFormatter.php
index c914a1246..7a09956e2 100644
--- a/Formatter/OutputFormatter.php
+++ b/Formatter/OutputFormatter.php
@@ -34,11 +34,11 @@ public function __clone()
     }
 
     /**
-     * Escapes "<" special char in given text.
+     * Escapes "<" and ">" special chars in given text.
      */
     public static function escape(string $text): string
     {
-        $text = preg_replace('/([^\\\\]?)</', '$1\\<', $text);
+        $text = preg_replace('/([^\\\\]|^)([<>])/', '$1\\\\$2', $text);
 
         return self::escapeTrailingBackslash($text);
     }
@@ -140,9 +140,10 @@ public function formatAndWrap(?string $message, int $width)
     {
         $offset = 0;
         $output = '';
-        $tagRegex = '[a-z][^<>]*+';
+        $openTagRegex = '[a-z](?:[^\\\\<>]*+ | \\\\.)*';
+        $closeTagRegex = '[a-z][^<>]*+';
         $currentLineLength = 0;
-        preg_match_all("#<(($tagRegex) | /($tagRegex)?)>#ix", $message, $matches, \PREG_OFFSET_CAPTURE);
+        preg_match_all("#<(($openTagRegex) | /($closeTagRegex)?)>#ix", $message, $matches, \PREG_OFFSET_CAPTURE);
         foreach ($matches[0] as $i => $match) {
             $pos = $match[1];
             $text = $match[0];
@@ -176,11 +177,7 @@ public function formatAndWrap(?string $message, int $width)
 
         $output .= $this->applyCurrentStyle(substr($message, $offset), $output, $width, $currentLineLength);
 
-        if (str_contains($output, "\0")) {
-            return strtr($output, ["\0" => '\\', '\\<' => '<']);
-        }
-
-        return str_replace('\\<', '<', $output);
+        return strtr($output, ["\0" => '\\', '\\<' => '<', '\\>' => '>']);
     }
 
     public function getStyleStack(): OutputFormatterStyleStack
@@ -211,7 +208,8 @@ private function createStyleFromString(string $string): ?OutputFormatterStyleInt
             } elseif ('bg' == $match[0]) {
                 $style->setBackground(strtolower($match[1]));
             } elseif ('href' === $match[0]) {
-                $style->setHref($match[1]);
+                $url = preg_replace('{\\\\([<>])}', '$1', $match[1]);
+                $style->setHref($url);
             } elseif ('options' === $match[0]) {
                 preg_match_all('([^,;]+)', strtolower($match[1]), $options);
                 $options = array_shift($options);
diff --git a/Helper/QuestionHelper.php b/Helper/QuestionHelper.php
index 3266a92df..2e1ccb2ab 100644
--- a/Helper/QuestionHelper.php
+++ b/Helper/QuestionHelper.php
@@ -246,6 +246,9 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
         $numMatches = \count($matches);
 
         $sttyMode = shell_exec('stty -g');
+        $isStdin = 'php://stdin' === (stream_get_meta_data($inputStream)['uri'] ?? null);
+        $r = [$inputStream];
+        $w = [];
 
         // Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
         shell_exec('stty -icanon -echo');
@@ -255,11 +258,15 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
 
         // Read a keypress
         while (!feof($inputStream)) {
+            while ($isStdin && 0 === @stream_select($r, $w, $w, 0, 100)) {
+                // Give signal handlers a chance to run
+                $r = [$inputStream];
+            }
             $c = fread($inputStream, 1);
 
             // as opposed to fgets(), fread() returns an empty string when the stream content is empty, not false.
             if (false === $c || ('' === $ret && '' === $c && null === $question->getDefault())) {
-                shell_exec(sprintf('stty %s', $sttyMode));
+                shell_exec('stty '.$sttyMode);
                 throw new MissingInputException('Aborted.');
             } elseif ("\177" === $c) { // Backspace Character
                 if (0 === $numMatches && 0 !== $i) {
@@ -364,7 +371,7 @@ function ($match) use ($ret) {
         }
 
         // Reset stty so it behaves normally again
-        shell_exec(sprintf('stty %s', $sttyMode));
+        shell_exec('stty '.$sttyMode);
 
         return $fullChoice;
     }
@@ -425,7 +432,7 @@ private function getHiddenResponse(OutputInterface $output, $inputStream, bool $
         $value = fgets($inputStream, 4096);
 
         if (self::$stty && Terminal::hasSttyAvailable()) {
-            shell_exec(sprintf('stty %s', $sttyMode));
+            shell_exec('stty '.$sttyMode);
         }
 
         if (false === $value) {
@@ -478,11 +485,11 @@ private function isInteractiveInput($inputStream): bool
         }
 
         if (\function_exists('stream_isatty')) {
-            return self::$stdinIsInteractive = stream_isatty(fopen('php://stdin', 'r'));
+            return self::$stdinIsInteractive = @stream_isatty(fopen('php://stdin', 'r'));
         }
 
         if (\function_exists('posix_isatty')) {
-            return self::$stdinIsInteractive = posix_isatty(fopen('php://stdin', 'r'));
+            return self::$stdinIsInteractive = @posix_isatty(fopen('php://stdin', 'r'));
         }
 
         if (!\function_exists('exec')) {
diff --git a/Input/StringInput.php b/Input/StringInput.php
index eb5c07fdd..76f1d5030 100644
--- a/Input/StringInput.php
+++ b/Input/StringInput.php
@@ -24,7 +24,7 @@
  */
 class StringInput extends ArgvInput
 {
-    public const REGEX_STRING = '([^\s]+?)(?:\s|(?<!\\\\)"|(?<!\\\\)\'|$)';
+    public const REGEX_STRING = '([^\s\\\\]+?)';
     public const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\')';
 
     /**
@@ -47,14 +47,25 @@ private function tokenize(string $input): array
         $tokens = [];
         $length = \strlen($input);
         $cursor = 0;
+        $token = null;
         while ($cursor < $length) {
+            if ('\\' === $input[$cursor]) {
+                $token .= $input[++$cursor] ?? '';
+                ++$cursor;
+                continue;
+            }
+
             if (preg_match('/\s+/A', $input, $match, 0, $cursor)) {
+                if (null !== $token) {
+                    $tokens[] = $token;
+                    $token = null;
+                }
             } elseif (preg_match('/([^="\'\s]+?)(=?)('.self::REGEX_QUOTED_STRING.'+)/A', $input, $match, 0, $cursor)) {
-                $tokens[] = $match[1].$match[2].stripcslashes(str_replace(['"\'', '\'"', '\'\'', '""'], '', substr($match[3], 1, -1)));
+                $token .= $match[1].$match[2].stripcslashes(str_replace(['"\'', '\'"', '\'\'', '""'], '', substr($match[3], 1, -1)));
             } elseif (preg_match('/'.self::REGEX_QUOTED_STRING.'/A', $input, $match, 0, $cursor)) {
-                $tokens[] = stripcslashes(substr($match[0], 1, -1));
+                $token .= stripcslashes(substr($match[0], 1, -1));
             } elseif (preg_match('/'.self::REGEX_STRING.'/A', $input, $match, 0, $cursor)) {
-                $tokens[] = stripcslashes($match[1]);
+                $token .= $match[1];
             } else {
                 // should never happen
                 throw new InvalidArgumentException(sprintf('Unable to parse input near "... %s ...".', substr($input, $cursor, 10)));
@@ -63,6 +74,10 @@ private function tokenize(string $input): array
             $cursor += \strlen($match[0]);
         }
 
+        if (null !== $token) {
+            $tokens[] = $token;
+        }
+
         return $tokens;
     }
 }
diff --git a/LICENSE b/LICENSE
index 9ff2d0d63..88bf75bb4 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2004-2021 Fabien Potencier
+Copyright (c) 2004-2022 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Output/ConsoleOutput.php b/Output/ConsoleOutput.php
index 3326cdf23..c6ba068a1 100644
--- a/Output/ConsoleOutput.php
+++ b/Output/ConsoleOutput.php
@@ -149,7 +149,8 @@ private function openOutputStream()
             return fopen('php://output', 'w');
         }
 
-        return @fopen('php://stdout', 'w') ?: fopen('php://output', 'w');
+        // Use STDOUT when possible to prevent from opening too many file descriptors
+        return \defined('STDOUT') ? \STDOUT : (@fopen('php://stdout', 'w') ?: fopen('php://output', 'w'));
     }
 
     /**
@@ -157,6 +158,11 @@ private function openOutputStream()
      */
     private function openErrorStream()
     {
-        return fopen($this->hasStderrSupport() ? 'php://stderr' : 'php://output', 'w');
+        if (!$this->hasStderrSupport()) {
+            return fopen('php://output', 'w');
+        }
+
+        // Use STDERR when possible to prevent from opening too many file descriptors
+        return \defined('STDERR') ? \STDERR : (@fopen('php://stderr', 'w') ?: fopen('php://output', 'w'));
     }
 }
diff --git a/Question/ChoiceQuestion.php b/Question/ChoiceQuestion.php
index 97121754c..e449ff683 100644
--- a/Question/ChoiceQuestion.php
+++ b/Question/ChoiceQuestion.php
@@ -119,18 +119,18 @@ private function getDefaultValidator(): callable
         return function ($selected) use ($choices, $errorMessage, $multiselect, $isAssoc) {
             if ($multiselect) {
                 // Check for a separated comma values
-                if (!preg_match('/^[^,]+(?:,[^,]+)*$/', $selected, $matches)) {
+                if (!preg_match('/^[^,]+(?:,[^,]+)*$/', (string) $selected, $matches)) {
                     throw new InvalidArgumentException(sprintf($errorMessage, $selected));
                 }
 
-                $selectedChoices = explode(',', $selected);
+                $selectedChoices = explode(',', (string) $selected);
             } else {
                 $selectedChoices = [$selected];
             }
 
             if ($this->isTrimmable()) {
                 foreach ($selectedChoices as $k => $v) {
-                    $selectedChoices[$k] = trim($v);
+                    $selectedChoices[$k] = trim((string) $v);
                 }
             }
 
diff --git a/Tests/ApplicationTest.php b/Tests/ApplicationTest.php
index 619009efe..c5acd5c86 100644
--- a/Tests/ApplicationTest.php
+++ b/Tests/ApplicationTest.php
@@ -38,9 +38,11 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\SignalRegistry\SignalRegistry;
+use Symfony\Component\Console\Terminal;
 use Symfony\Component\Console\Tester\ApplicationTester;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Process\Process;
 
 class ApplicationTest extends TestCase
 {
@@ -1882,6 +1884,39 @@ public function testSignalableCommandInterfaceWithoutSignals()
         $application->add($command);
         $this->assertSame(0, $application->run(new ArrayInput(['signal'])));
     }
+
+    /**
+     * @group tty
+     */
+    public function testSignalableRestoresStty()
+    {
+        if (!Terminal::hasSttyAvailable()) {
+            $this->markTestSkipped('stty not available');
+        }
+
+        if (!SignalRegistry::isSupported()) {
+            $this->markTestSkipped('pcntl signals not available');
+        }
+
+        $previousSttyMode = shell_exec('stty -g');
+
+        $p = new Process(['php', __DIR__.'/Fixtures/application_signalable.php']);
+        $p->setTty(true);
+        $p->start();
+
+        for ($i = 0; $i < 10 && shell_exec('stty -g') === $previousSttyMode; ++$i) {
+            usleep(100000);
+        }
+
+        $this->assertNotSame($previousSttyMode, shell_exec('stty -g'));
+        $p->signal(\SIGINT);
+        $p->wait();
+
+        $sttyMode = shell_exec('stty -g');
+        shell_exec('stty '.$previousSttyMode);
+
+        $this->assertSame($previousSttyMode, $sttyMode);
+    }
 }
 
 class CustomApplication extends Application
diff --git a/Tests/Fixtures/application_signalable.php b/Tests/Fixtures/application_signalable.php
new file mode 100644
index 000000000..0194703b2
--- /dev/null
+++ b/Tests/Fixtures/application_signalable.php
@@ -0,0 +1,36 @@
+<?php
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\SignalableCommandInterface;
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+use Symfony\Component\Console\SingleCommandApplication;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+(new class() extends SingleCommandApplication implements SignalableCommandInterface {
+    public function getSubscribedSignals(): array
+    {
+        return [SIGINT];
+    }
+
+    public function handleSignal(int $signal): void
+    {
+        exit;
+    }
+})
+    ->setCode(function(InputInterface $input, OutputInterface $output) {
+        $this->getHelper('question')
+             ->ask($input, $output, new ChoiceQuestion('😊', ['y']));
+
+        return 0;
+    })
+    ->run()
+
+;
diff --git a/Tests/Fixtures/command_2.txt b/Tests/Fixtures/command_2.txt
index 45e7bec4d..fcab77a29 100644
--- a/Tests/Fixtures/command_2.txt
+++ b/Tests/Fixtures/command_2.txt
@@ -2,9 +2,9 @@
   command 2 description
 
 <comment>Usage:</comment>
-  descriptor:command2 [options] [--] \<argument_name>
-  descriptor:command2 -o|--option_name \<argument_name>
-  descriptor:command2 \<argument_name>
+  descriptor:command2 [options] [--] \<argument_name\>
+  descriptor:command2 -o|--option_name \<argument_name\>
+  descriptor:command2 \<argument_name\>
 
 <comment>Arguments:</comment>
   <info>argument_name</info>      
diff --git a/Tests/Fixtures/command_mbstring.txt b/Tests/Fixtures/command_mbstring.txt
index 2fd51d057..1fa4e3135 100644
--- a/Tests/Fixtures/command_mbstring.txt
+++ b/Tests/Fixtures/command_mbstring.txt
@@ -2,9 +2,9 @@
   command åèä description
 
 <comment>Usage:</comment>
-  descriptor:åèä [options] [--] \<argument_åèä>
-  descriptor:åèä -o|--option_name \<argument_name>
-  descriptor:åèä \<argument_name>
+  descriptor:åèä [options] [--] \<argument_åèä\>
+  descriptor:åèä -o|--option_name \<argument_name\>
+  descriptor:åèä \<argument_name\>
 
 <comment>Arguments:</comment>
   <info>argument_åèä</info>   
diff --git a/Tests/Fixtures/input_argument_with_style.txt b/Tests/Fixtures/input_argument_with_style.txt
index 35384a6be..79149ca69 100644
--- a/Tests/Fixtures/input_argument_with_style.txt
+++ b/Tests/Fixtures/input_argument_with_style.txt
@@ -1 +1 @@
-  <info>argument_name</info>  argument description<comment> [default: "\<comment>style\</>"]</comment>
+  <info>argument_name</info>  argument description<comment> [default: "\<comment\>style\</\>"]</comment>
diff --git a/Tests/Fixtures/input_option_with_style.txt b/Tests/Fixtures/input_option_with_style.txt
index 880a53518..4bd30a662 100644
--- a/Tests/Fixtures/input_option_with_style.txt
+++ b/Tests/Fixtures/input_option_with_style.txt
@@ -1 +1 @@
-  <info>-o, --option_name=OPTION_NAME</info>  option description<comment> [default: "\<comment>style\</>"]</comment>
+  <info>-o, --option_name=OPTION_NAME</info>  option description<comment> [default: "\<comment\>style\</\>"]</comment>
diff --git a/Tests/Fixtures/input_option_with_style_array.txt b/Tests/Fixtures/input_option_with_style_array.txt
index 265c18c5a..1fbb05b8a 100644
--- a/Tests/Fixtures/input_option_with_style_array.txt
+++ b/Tests/Fixtures/input_option_with_style_array.txt
@@ -1 +1 @@
-  <info>-o, --option_name=OPTION_NAME</info>  option description<comment> [default: ["\<comment>Hello\</comment>","\<info>world\</info>"]]</comment><comment> (multiple values allowed)</comment>
+  <info>-o, --option_name=OPTION_NAME</info>  option description<comment> [default: ["\<comment\>Hello\</comment\>","\<info\>world\</info\>"]]</comment><comment> (multiple values allowed)</comment>
diff --git a/Tests/Formatter/OutputFormatterTest.php b/Tests/Formatter/OutputFormatterTest.php
index 1a6aae23e..3ad18b897 100644
--- a/Tests/Formatter/OutputFormatterTest.php
+++ b/Tests/Formatter/OutputFormatterTest.php
@@ -32,7 +32,10 @@ public function testLGCharEscaping()
         $this->assertEquals('foo << bar \\', $formatter->format('foo << bar \\'));
         $this->assertEquals("foo << \033[32mbar \\ baz\033[39m \\", $formatter->format('foo << <info>bar \\ baz</info> \\'));
         $this->assertEquals('<info>some info</info>', $formatter->format('\\<info>some info\\</info>'));
-        $this->assertEquals('\\<info>some info\\</info>', OutputFormatter::escape('<info>some info</info>'));
+        $this->assertEquals('\\<info\\>some info\\</info\\>', OutputFormatter::escape('<info>some info</info>'));
+        // every < and > gets escaped if not already escaped, but already escaped ones do not get escaped again
+        // and escaped backslashes remain as such, same with backslashes escaping non-special characters
+        $this->assertEquals('foo \\< bar \\< baz \\\\< foo \\> bar \\> baz \\\\> \\x', OutputFormatter::escape('foo < bar \\< baz \\\\< foo > bar \\> baz \\\\> \\x'));
 
         $this->assertEquals(
             "\033[33mSymfony\\Component\\Console does work very well!\033[39m",
@@ -264,6 +267,7 @@ public function provideDecoratedAndNonDecoratedOutput()
             ['<question>some question</question>', 'some question', "\033[30;46msome question\033[39;49m"],
             ['<fg=red>some text with inline style</>', 'some text with inline style', "\033[31msome text with inline style\033[39m"],
             ['<href=idea://open/?file=/path/SomeFile.php&line=12>some URL</>', 'some URL', "\033]8;;idea://open/?file=/path/SomeFile.php&line=12\033\\some URL\033]8;;\033\\"],
+            ['<href=https://example.com/\<woohoo\>>some URL with \<woohoo\></>', 'some URL with <woohoo>', "\033]8;;https://example.com/<woohoo>\033\\some URL with <woohoo>\033]8;;\033\\"],
             ['<href=idea://open/?file=/path/SomeFile.php&line=12>some URL</>', 'some URL', 'some URL', 'JetBrains-JediTerm'],
         ];
     }
diff --git a/Tests/Helper/FormatterHelperTest.php b/Tests/Helper/FormatterHelperTest.php
index 934e11ac1..c9a3c5e00 100644
--- a/Tests/Helper/FormatterHelperTest.php
+++ b/Tests/Helper/FormatterHelperTest.php
@@ -83,9 +83,9 @@ public function testFormatBlockLGEscaping()
         $formatter = new FormatterHelper();
 
         $this->assertEquals(
-            '<error>                            </error>'."\n".
-            '<error>  \<info>some info\</info>  </error>'."\n".
-            '<error>                            </error>',
+            '<error>                              </error>'."\n".
+            '<error>  \<info\>some info\</info\>  </error>'."\n".
+            '<error>                              </error>',
             $formatter->formatBlock('<info>some info</info>', 'error', true),
             '::formatBlock() escapes \'<\' chars'
         );
diff --git a/Tests/Input/StringInputTest.php b/Tests/Input/StringInputTest.php
index f781b7ccf..2bd40dec9 100644
--- a/Tests/Input/StringInputTest.php
+++ b/Tests/Input/StringInputTest.php
@@ -71,6 +71,7 @@ public function getTokenizeData()
             ["--long-option='foo bar''another'", ['--long-option=foo baranother'], '->tokenize() parses long options with a value'],
             ["--long-option='foo bar'\"another\"", ['--long-option=foo baranother'], '->tokenize() parses long options with a value'],
             ['foo -a -ffoo --long bar', ['foo', '-a', '-ffoo', '--long', 'bar'], '->tokenize() parses when several arguments and options'],
+            ["--arg=\\\"'Jenny'\''s'\\\"", ["--arg=\"Jenny's\""], '->tokenize() parses quoted quotes'],
         ];
     }
 
diff --git a/Tests/Question/ChoiceQuestionTest.php b/Tests/Question/ChoiceQuestionTest.php
index 8a48cfcf1..8de26419f 100644
--- a/Tests/Question/ChoiceQuestionTest.php
+++ b/Tests/Question/ChoiceQuestionTest.php
@@ -19,14 +19,15 @@ class ChoiceQuestionTest extends TestCase
     /**
      * @dataProvider selectUseCases
      */
-    public function testSelectUseCases($multiSelect, $answers, $expected, $message)
+    public function testSelectUseCases($multiSelect, $answers, $expected, $message, $default = null)
     {
         $question = new ChoiceQuestion('A question', [
             'First response',
             'Second response',
             'Third response',
             'Fourth response',
-        ]);
+            null,
+        ], $default);
 
         $question->setMultiselect($multiSelect);
 
@@ -59,6 +60,19 @@ public function selectUseCases()
                 ['First response', 'Second response'],
                 'When passed multiple answers on MultiSelect, the defaultValidator must return these answers as an array',
             ],
+            [
+                false,
+                [null],
+                null,
+                'When used null as default single answer on singleSelect, the defaultValidator must return this answer as null',
+            ],
+            [
+                false,
+                ['First response'],
+                'First response',
+                'When used a string as default single answer on singleSelect, the defaultValidator must return this answer as a string',
+                'First response',
+            ],
             [
                 false,
                 [0],