Core: rnotwhite -> rhtmlnotwhite and jQuery.trim -> stripAndCollapse

- Renames and changes rnotwhite to focus on HTML whitespace chars
- Change internal use of jQuery.trim to more accurate strip and collapse
- Adds tests to ensure HTML space characters are retained where valid
- Doesn't add tests where the difference is inconsequential and
  existing tests are adequate.

Fixes gh-3003
Fixes gh-3072
Close gh-3316

1 files changed, 12 insertions, 0 deletions

diff --git a/src/core/stripAndCollapse.js b/src/core/stripAndCollapse.js
new file mode 100644
index 000000000..797d9f531
--- /dev/null
+++ b/src/core/stripAndCollapse.js
@@ -0,0 +1,12 @@
+define( function() {
+	"use strict";
+
+	// Strip and collapse whitespace according to HTML spec
+	// https://html.spec.whatwg.org/multipage/infrastructure.html#strip-and-collapse-whitespace
+	var rhtmlSpace = /[\x20\t\r\n\f]+/g,
+		stripAndCollapse = function( value ) {
+			return ( " " + value + " " ).replace( rhtmlSpace, " " ).slice( 1, -1 );
+		};
+
+	return stripAndCollapse;
+} );