Generic/DisallowSpaceIndent: add test with multi-line yield from

As the indentation whitespace in a multi-line `yield from` expression is now tokenized as `T_WHITESPACE`, instead of being tokenized as part of the (second) `T_YIELD_FROM` token, space indentation of such a line will now be handled correctly by the sniff.

This commit just adds a test to confirm and safeguard this.

Author: jrfnl

src/Standards/Generic/Tests/WhiteSpace/DisallowSpaceIndentUnitTest.1.inc

@@ -116,3 +116,10 @@ $x = 1;
 
      Another line.
      */
+
+// A `yield from` can be multiline and may contain spaces in the indentation whitespace between the keywords.
+function myGenerator() {
+	yield
+    from
+	gen2();
+}

src/Standards/Generic/Tests/WhiteSpace/DisallowSpaceIndentUnitTest.1.inc.fixed

@@ -116,3 +116,10 @@ $x = 1;
 
 	 Another line.
 	 */
+
+// A `yield from` can be multiline and may contain spaces in the indentation whitespace between the keywords.
+function myGenerator() {
+	yield
+	from
+	gen2();
+}

src/Standards/Generic/Tests/WhiteSpace/DisallowSpaceIndentUnitTest.2.inc

@@ -116,3 +116,10 @@ $x = 1;
 
      Another line.
      */
+
+// A `yield from` can be multiline and may contain spaces in the indentation whitespace between the keywords.
+function myGenerator() {
+	yield
+    from
+	gen2();
+}

src/Standards/Generic/Tests/WhiteSpace/DisallowSpaceIndentUnitTest.2.inc.fixed

@@ -116,3 +116,10 @@ $x = 1;
 
 	 Another line.
 	 */
+
+// A `yield from` can be multiline and may contain spaces in the indentation whitespace between the keywords.
+function myGenerator() {
+	yield
+	from
+	gen2();
+}

src/Standards/Generic/Tests/WhiteSpace/DisallowSpaceIndentUnitTest.php

@@ -89,6 +89,7 @@ public function getErrorList($testFile='')
                 115 => 1,
                 117 => 1,
                 118 => 1,
+                123 => 1,
             ];
 
         case 'DisallowSpaceIndentUnitTest.3.inc':