php-diff: Fix undefined offset in Array Renderer

See chrisboulton/php-diff#51

Author: lazyfrosch

library/vendor/php-diff/SOURCE

@@ -3,17 +3,34 @@
 set -ex
 
 # version based on current master 3cb3f7ce6bb8b910f5a41ea1887b1faceba6a7d7
-# plus https://github.com/chrisboulton/php-diff/pull/50
+# plus pull requests:
+# - https://github.com/chrisboulton/php-diff/pull/50
+# - https://github.com/chrisboulton/php-diff/pull/51
+
 git clone https://github.com/chrisboulton/php-diff.git
 
 cd php-diff
 
-git fetch origin pull/50/head:pr
-git checkout a9f124f81a9436138879e56157c6cced52a6d95b
-git show -s
+# master
+git checkout 3cb3f7ce6bb8b910f5a41ea1887b1faceba6a7d7
+
+# PR #50
+git fetch origin pull/50/head:pr-50
+git cherry-pick a9f124f81a9436138879e56157c6cced52a6d95b
+
+# PR #51
+git fetch origin pull/51/head:pr-51
+git cherry-pick cb0d0781bcc6b0ae39d73715c659a6d2717d28e1
+
+git log -4
 
 rm -rf .git
 rm -rf .gitignore
 rm -rf composer.json
 rm -rf example tests phpunit.xml
 cd ..
+
+echo "Now you can run:"
+echo "  rsync -av php-diff/ ./ --delete --exclude=SOURCE --exclude=php-diff/"
+echo "and:"
+echo "  rm -rf php-diff/"

library/vendor/php-diff/lib/Diff/Renderer/Html/Array.php

@@ -190,9 +190,14 @@ protected function formatLines($lines)
 	 */
 	private function fixSpaces(array $matches)
 	{
-		$spaces = $matches[1];
-		$count = strlen($spaces);
-		if($count == 0) {
+		$count = 0;
+
+		if (count($matches) > 1) {
+			$spaces = $matches[1];
+			$count = strlen($spaces);
+		}
+
+		if ($count == 0) {
 			return '';
 		}