General: Correct handling of Korean.

Author: arnt

src/wp-includes/formatting.php

@@ -2220,10 +2220,11 @@ function uses_single_unicode_script( string $input ): bool {
 				case IntlChar::BLOCK_CODE_DEVANAGARI_EXTENDED:
 					$b = IntlChar::BLOCK_CODE_DEVANAGARI;
 					break;
-				case IntlChar::BLOCK_CODE_HANGUL_JAMO:
+				case IntlChar::BLOCK_CODE_HANGUL_COMPATIBILITY_JAMO:
 				case IntlChar::BLOCK_CODE_HANGUL_JAMO_EXTENDED_A:
 				case IntlChar::BLOCK_CODE_HANGUL_JAMO_EXTENDED_B:
-					$b = IntlChar::BLOCK_CODE_HANGUL;
+				case IntlChar::BLOCK_CODE_HANGUL_SYLLABLES:
+					$b = IntlChar::BLOCK_CODE_HANGUL_JAMO;
 					break;
 				case IntlChar::BLOCK_CODE_MYANMAR_EXTENDED_A:
 				case IntlChar::BLOCK_CODE_MYANMAR_EXTENDED_B:

tests/phpunit/tests/formatting/antispambot.php

@@ -10,8 +10,8 @@ class Tests_Formatting_antispambot extends WP_UnitTestCase {
 	/**
 	 * This is basically a driveby test. While working on ticket
 	 * 31992 I noticed that there was no unit testing for
-		 * antispambot, so I added a little, just so I'd leave
-		 * the code better than I found it.
+	 * antispambot, so I added a little, just so I'd leave the code
+	 * better than I found it.
 	 *
 	 * @ticket 31992
 	 *