Add method generateLinesIgnore

Currently the line is commented out, because the method is not required
 until the deprecation period for missing this method is over.

lib/jblond/Diff/Renderer/SubRendererInterface.php

@@ -41,13 +41,6 @@ public function generateDiffHeader(): string;
      */
     public function generateBlockHeader(array $changes): string;
 
-    /**
-     * Generate a string representation of lines that are skipped in the diff view.
-     *
-     * @return string Representation of skipped lines.
-     */
-    public function generateSkippedLines(): string;
-
     /**
      * Generate a string representation of lines without differences between both versions.
      *
@@ -69,6 +62,23 @@ public function generateLinesEqual(array $changes): string;
      */
     public function generateLinesInsert(array $changes): string;
 
+    /**
+     * Generate a string representation of lines that are skipped in the diff view.
+     *
+     * @return string Representation of skipped lines.
+     */
+    public function generateSkippedLines(): string;
+
+    /**
+     * Generate a string representation of lines with ignored differences between both versions.
+     *
+     * @param   array  $changes  Contains the op-codes about the changes between two blocks of text.
+     *
+     * @return string Text with no difference.
+     * @todo: Uncomment once deprecation period is over.
+     */
+    // public function generateLinesIgnore(array $changes): string;
+
     /**
      * Generate a string representation of lines that are removed from the 2nd version.
      *