Script Loader: Fix unintended adding of async to scripts that are printed directly with wp_print_scripts() without enqueueing them beforehand.

Props: joemcgill, westonruter, felixarntz, peterwilsoncc.
See: #58648.

git-svn-id: https://develop.svn.wordpress.org/trunk@56092 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/dependencies/scripts.php

@@ -2931,6 +2931,21 @@ HTML
 		$this->assertSame( $expected, $print_scripts );
 	}
 
+	/**
+	 * Ensure tinymce scripts aren't loading async.
+	 *
+	 * @ticket 58648
+	 */
+	public function test_printing_tinymce_scripts() {
+		global $wp_scripts;
+
+		wp_register_tinymce_scripts( $wp_scripts, true );
+
+		$actual = get_echo( 'wp_print_scripts', array( array( 'wp-tinymce' ) ) );
+
+		$this->assertStringNotContainsString( 'async', $actual );
+	}
+
 	/**
 	 * Parse an HTML markup fragment.
 	 *