optimize show_diff_size_warning?

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/helpers/diff_helper.rb

 module DiffHelper
-  def safe_diff_files(diffs)
+  def allowed_diff_size
     if diff_hard_limit_enabled?
-      diffs.first(Commit::DIFF_HARD_LIMIT_FILES)
+      Commit::DIFF_HARD_LIMIT_FILES
     else
-      diffs.first(Commit::DIFF_SAFE_FILES)
-    end.map do |diff|
+      Commit::DIFF_SAFE_FILES
+    end
+  end
+
+  def safe_diff_files(diffs)
+    diffs.first(allowed_diff_size).map do |diff|
       Gitlab::Diff::File.new(diff)
     end
   end
 
   def show_diff_size_warninig?(diffs)
-    safe_diff_files(diffs).size < diffs.size
+    diffs.size > allowed_diff_size
   end
 
   def diff_hard_limit_enabled?

app/views/projects/diffs/_diffs.html.haml

@@ -11,6 +11,7 @@
         - params_copy[:view] = 'inline'
         = link_to "Inline Diff", url_for(params_copy), {id: "commit-diff-viewtype"}
 
+
 - if show_diff_size_warninig?(diffs)
   = render 'projects/diffs/warning', diffs: diffs
 

app/views/projects/diffs/_warning.html.haml

@@ -14,6 +14,6 @@
           = link_to "Email patch", project_merge_request_path(@project, @merge_request, format: :patch), class: "btn btn-warning btn-small"
   %p
     To preserve performance only
-    %strong #{safe_diff_files(@project, diffs).size} of #{diffs.size}
+    %strong #{allowed_diff_size} of #{diffs.size}
     files displayed.