Adjust applied suggestion reverting previous changes

1. Avoid suggestions being applied on the same file
from reverting previous changes
2. Gracefully use and handle file changes error
when updating the file (though, it does not totally
solves the sync problem for multiple suggestion
applications at once)

1 files changed, 10 insertions, 2 deletions

diff --git a/app/models/suggestion.rb b/app/models/suggestion.rb
index c76b8e71507..7eee4fbbe5f 100644
--- a/app/models/suggestion.rb
+++ b/app/models/suggestion.rb
@@ -5,8 +5,7 @@ class Suggestion < ApplicationRecord
   validates :note, presence: true
   validates :commit_id, presence: true, if: :applied?
 
-  delegate :original_position, :position, :diff_file,
-    :noteable, to: :note
+  delegate :original_position, :position, :noteable, to: :note
 
   def project
     noteable.source_project
@@ -16,6 +15,15 @@ class Suggestion < ApplicationRecord
     noteable.source_branch
   end
 
+  def file_path
+    position.file_path
+  end
+
+  def diff_file
+    repository = project.repository
+    position.diff_file(repository)
+  end
+
   # For now, suggestions only serve as a way to send patches that
   # will change a single line (being able to apply multiple in the same place),
   # which explains `from_line` and `to_line` being the same line.