[12.x] Revert lowercasing validation message placeholders (#57733)

* Revert lowercasing validation message placeholders

* Remove unused import

* Opened the wrong file and commited prematurely

Author: florianraith

src/Illuminate/Validation/Concerns/ReplacesAttributes.php

@@ -938,7 +938,7 @@ protected function replaceDoesntContain($message, $attribute, $rule, $parameters
      */
     private function replaceWhileKeepingCase(string $message, array $mapping): string
     {
-        $fn = [Str::lower(...), Str::upper(...), Str::ucfirst(...)];
+        $fn = [fn ($v) => $v, Str::upper(...), Str::ucfirst(...)];
 
         $cases = array_reduce(
             array_keys($mapping),

tests/Validation/ValidationValidatorTest.php

@@ -639,6 +639,12 @@ public function testCapitalizedDisplayableValuesAreReplaced()
         $v->messages()->setFormat(':message');
         $this->assertSame('The foo field must be accepted when BAR is AAA.', $v->messages()->first('foo'));
 
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.accepted_if' => 'The :attribute field must be accepted when :other is :value.'], 'en');
+        $v = new Validator($trans, ['foo' => 'no', 'bar' => 'aAa'], ['foo' => 'accepted_if:bar,aAa']);
+        $this->assertFalse($v->passes());
+        $this->assertSame('The foo field must be accepted when bar is aAa.', $v->messages()->first('foo'));
+
         // in_array
         $trans = $this->getIlluminateArrayTranslator();
         $trans->addLines(['validation.in_array' => 'The value of :attribute does not exist in :Other.'], 'en');
@@ -715,6 +721,12 @@ public function testCapitalizedDisplayableValuesAreReplaced()
         $this->assertFalse($v->passes());
         $this->assertSame('The last field is required unless FIRST is in TAYLOR, SVEN.', $v->messages()->first('last'));
 
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.required_unless' => 'The :attribute field is required unless :other is in :values.'], 'en');
+        $v = new Validator($trans, ['firstName' => 'dAyle', 'lastName' => ''], ['lastName' => 'RequiredUnless:firstName,tAylor,sVen']);
+        $this->assertFalse($v->passes());
+        $this->assertSame('The last name field is required unless first name is in tAylor, sVen.', $v->messages()->first('lastName'));
+
         // required_with
         $trans = $this->getIlluminateArrayTranslator();
         $trans->addLines(['validation.required_with' => 'The :attribute field is required when :Values is present.'], 'en');
@@ -753,6 +765,12 @@ public function testCapitalizedDisplayableValuesAreReplaced()
         $v = new Validator($trans, ['url' => 'laravel.com'], ['url' => 'starts_with:http,https']);
         $this->assertFalse($v->passes());
         $this->assertSame('The url must start with one of the following values HTTP, HTTPS', $v->messages()->first('url'));
+
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.starts_with' => 'The :attribute must start with one of the following values :values'], 'en');
+        $v = new Validator($trans, ['url' => 'laravel.com'], ['url' => 'starts_with:hTtp,hTtps']);
+        $this->assertFalse($v->passes());
+        $this->assertSame('The url must start with one of the following values hTtp, hTtps', $v->messages()->first('url'));
     }
 
     public function testInputIsReplacedByItsDisplayableValue()