In wptexturize(), don't convert C-style hexadecimals to mathematical ×.

Adds unit tests.

Props harrym, kurtpayne, miqrogroove.
Fixes #19308.


git-svn-id: https://develop.svn.wordpress.org/trunk@28719 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/formatting/WPTexturize.php

@@ -780,10 +780,30 @@ class Tests_Formatting_WPTexturize extends WP_UnitTestCase {
 				"12x34",
 				"12×34",
 			),
+			array(
+				"-123x1=-123",
+				"-123×1=-123",
+			),
+			array(
+				"-123x-1",
+				"-123×-1",
+			),
+			array(
+				"0.675x1=0.675",
+				"0.675×1=0.675",
+			),
 			array(
 				"9 x 9",
 				"9 x 9",
 			),
+			array(
+				"0x70",
+				"0x70",
+			),
+			array(
+				"3x2x1x0",
+				"3x2x1x0",
+			),
 		);
 	}