Increase COMMITS_SAFE_SIZE to reasonable size in compare to diff limits. Fix reload with full diff link

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

app/models/merge_request_diff.rb

@@ -16,9 +16,8 @@ require Rails.root.join("app/models/commit")
 class MergeRequestDiff < ActiveRecord::Base
   include Sortable
 
-  # Prevent store of diff
-  # if commits amount more then 200
-  COMMITS_SAFE_SIZE = 200
+  # Prevent store of diff if commits amount more then 500
+  COMMITS_SAFE_SIZE = 500
 
   attr_reader :commits, :diffs
 
@@ -124,12 +123,12 @@ class MergeRequestDiff < ActiveRecord::Base
     if new_diffs.any?
       if new_diffs.size > Commit::DIFF_HARD_LIMIT_FILES
         self.state = :overflow_diff_files_limit
-        new_diffs = []
+        new_diffs = new_diffs.first[Commit::DIFF_HARD_LIMIT_LINES]
       end
 
       if new_diffs.sum { |diff| diff.diff.lines.count } > Commit::DIFF_HARD_LIMIT_LINES
         self.state = :overflow_diff_lines_limit
-        new_diffs = []
+        new_diffs = new_diffs.first[Commit::DIFF_HARD_LIMIT_LINES]
       end
     end
 

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

@@ -3,7 +3,7 @@
     Too many changes to show.
     .pull-right
       - unless diff_hard_limit_enabled?
-        = link_to "Reload with full diff", url_for(params.merge(force_show_diff: true)), class: "btn btn-sm btn-warning"
+        = link_to "Reload with full diff", url_for(params.merge(force_show_diff: true, format: nil)), class: "btn btn-sm btn-warning"
 
       - if current_controller?(:commit) or current_controller?(:merge_requests)
         - if current_controller?(:commit)