Fix method visibility in inline diff class

lib/gitlab/diff/inline_diff.rb

@@ -19,24 +19,6 @@ module Gitlab
 
       attr_accessor :old_line, :new_line, :offset
 
-      def self.for_lines(lines)
-        changed_line_pairs = self.find_changed_line_pairs(lines)
-
-        inline_diffs = []
-
-        changed_line_pairs.each do |old_index, new_index|
-          old_line = lines[old_index]
-          new_line = lines[new_index]
-
-          old_diffs, new_diffs = new(old_line, new_line, offset: 1).inline_diffs
-
-          inline_diffs[old_index] = old_diffs
-          inline_diffs[new_index] = new_diffs
-        end
-
-        inline_diffs
-      end
-
       def initialize(old_line, new_line, offset: 0)
         @old_line = old_line[offset..-1]
         @new_line = new_line[offset..-1]
@@ -63,32 +45,54 @@ module Gitlab
         [old_diffs, new_diffs]
       end
 
-      private
+      class << self
+        def for_lines(lines)
+          changed_line_pairs = find_changed_line_pairs(lines)
 
-      # Finds pairs of old/new line pairs that represent the same line that changed
-      def self.find_changed_line_pairs(lines)
-        # Prefixes of all diff lines, indicating their types
-        # For example: `" - +  -+  ---+++ --+  -++"`
-        line_prefixes = lines.each_with_object("") { |line, s| s << line[0] }.gsub(/[^ +-]/, ' ')
+          inline_diffs = []
 
-        changed_line_pairs = []
-        line_prefixes.scan(LINE_PAIRS_PATTERN) do
-          # For `"---+++"`, `begin_index == 0`, `end_index == 6`
-          begin_index, end_index = Regexp.last_match.offset(:del_ins)
+          changed_line_pairs.each do |old_index, new_index|
+            old_line = lines[old_index]
+            new_line = lines[new_index]
 
-          # For `"---+++"`, `changed_line_count == 3`
-          changed_line_count = (end_index - begin_index) / 2
+            old_diffs, new_diffs = new(old_line, new_line, offset: 1).inline_diffs
 
-          halfway_index = begin_index + changed_line_count
-          (begin_index...halfway_index).each do |i|
-            # For `"---+++"`, index 1 maps to 1 + 3 = 4
-            changed_line_pairs << [i, i + changed_line_count]
+            inline_diffs[old_index] = old_diffs
+            inline_diffs[new_index] = new_diffs
           end
+
+          inline_diffs
         end
 
-        changed_line_pairs
+        private
+
+        # Finds pairs of old/new line pairs that represent the same line that changed
+        def find_changed_line_pairs(lines)
+          # Prefixes of all diff lines, indicating their types
+          # For example: `" - +  -+  ---+++ --+  -++"`
+          line_prefixes = lines.each_with_object("") { |line, s| s << line[0] }.gsub(/[^ +-]/, ' ')
+
+          changed_line_pairs = []
+          line_prefixes.scan(LINE_PAIRS_PATTERN) do
+            # For `"---+++"`, `begin_index == 0`, `end_index == 6`
+            begin_index, end_index = Regexp.last_match.offset(:del_ins)
+
+            # For `"---+++"`, `changed_line_count == 3`
+            changed_line_count = (end_index - begin_index) / 2
+
+            halfway_index = begin_index + changed_line_count
+            (begin_index...halfway_index).each do |i|
+              # For `"---+++"`, index 1 maps to 1 + 3 = 4
+              changed_line_pairs << [i, i + changed_line_count]
+            end
+          end
+
+          changed_line_pairs
+        end
       end
 
+      private
+
       def longest_common_prefix(a, b)
         max_length = [a.length, b.length].max