Merge branch 'new-diff-notes' into 'master'

New diff notes

Fixes #12732, #14731, #19375, #14783 

Builds on https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4110

To do:
- [x] Get it mostly working
- [x] Validate position validity
- [x] Fix: Don’t link to `#`
- [x] Fix: Base ref can be `nil`, potentially, when the MR has an oprhan source branch => Yep, doesn’t work. We need to store a `start_id`
- [x] Optimize: Fewer duplicate `git diff` compares
- [x] Optimize: Pass paths to `PositionTracer#diff` for faster diffs
- [x] Refactor: Use `head_id` in `MergeRequest`/`MergeRequestDiff` instead of `source_sha`
- [x] Refactor: Convert existing array-based diff refs to the DiffRefs model
- [x] Tweak: Use `note_type` in `Autosave` key
- [x] Tweak: Remove `line_code: note.line_code` from `link_to_reply_discussion`
- [x] Update: `SentNotifications` and reply-by-email receiver
- [x] Update: MR diff notification email
- [x] Update: API (MR, Commit note creation and entity)
- [x] Update: GitHub importer
- [x] Address any other TODO comments
- [x] Fix: Suppress "edited 4 minutes ago"
- [x] Write tests
  - [x] `LineMapper`
  - [x] `PositionTracer`
  - [x] `Position`
  - [x] `DiffPositionUpdateService`
  - [x] `DiffNote`
  - [x] `MergeRequests::RefreshService` / `MergeRequest#update_diff_notes_positions`
- [x] Make sure commits with diff notes don't get cleaned up, since this would prevent the diff notes from being rendered (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5062)

Future improvements:
- Display unresolved comments on files outside the diff, if the comment was added when that file _was_ part of the diff
- Allow commenting on sections between hunks, when expanding the diff using `...`
  - (We'd need to generate line code based on Position if we have it, even if it falls outside bounds of diff)
- `diff_hunk` on diff note API entity
- Show diff hunk in notification email
- Resolved line notes would have a boolean, and be inactive through `notes.any? { !active? || resolved? }`
- Multi line notes would store a number of positions, and do the right thing (™) in grouping and then rendering if the first item is multiline? => true
- Image diff notes could store x,y,width,height instead of old_line,new_line for similar grouping. Does it need a reference to say if it's on old or new? These can't have line_codes, clearly. Rendering would be interesting.
- Show commit line comments in the MR diff
- Comment on specific selected words
- Comment on file header
- Unfold top of discussion diff note
- New diff notes API for commits and MRs

/cc @rspeicher

See merge request !4101

1 files changed, 11 insertions, 2 deletions

diff --git a/app/assets/javascripts/notes.js.coffee b/app/assets/javascripts/notes.js.coffee
index 7c1d943667b..0b7d8f64456 100644
--- a/app/assets/javascripts/notes.js.coffee
+++ b/app/assets/javascripts/notes.js.coffee
@@ -240,12 +240,16 @@ class @Notes
 
     @note_ids.push(note.id)
     form = $("#new-discussion-note-form-#{note.discussion_id}")
+    if note.original_discussion_id? and form.length is 0
+      form = $("#new-discussion-note-form-#{note.original_discussion_id}")
     row = form.closest("tr")
     note_html = $(note.html)
     note_html.syntaxHighlight()
 
     # is this the first note of discussion?
     discussionContainer = $(".notes[data-discussion-id='" + note.discussion_id + "']")
+    if note.original_discussion_id? and discussionContainer.length is 0
+      discussionContainer = $(".notes[data-discussion-id='" + note.original_discussion_id + "']")
     if discussionContainer.length is 0
       # insert the note and the reply button after the temp row
       row.after note.discussion_html
@@ -318,6 +322,7 @@ class @Notes
     form.addClass "js-main-target-form"
 
     form.find("#note_line_code").remove()
+    form.find("#note_position").remove()
     form.find("#note_type").remove()
 
   ###
@@ -335,10 +340,12 @@ class @Notes
 
     new Autosave textarea, [
       "Note"
-      form.find("#note_commit_id").val()
-      form.find("#note_line_code").val()
       form.find("#note_noteable_type").val()
       form.find("#note_noteable_id").val()
+      form.find("#note_commit_id").val()
+      form.find("#note_type").val()
+      form.find("#note_line_code").val()
+      form.find("#note_position").val()
     ]
 
   ###
@@ -512,10 +519,12 @@ class @Notes
   setupDiscussionNoteForm: (dataHolder, form) =>
     # setup note target
     form.attr 'id', "new-discussion-note-form-#{dataHolder.data("discussionId")}"
+    form.attr "data-line-code", dataHolder.data("lineCode")
     form.find("#note_type").val dataHolder.data("noteType")
     form.find("#line_type").val dataHolder.data("lineType")
     form.find("#note_commit_id").val dataHolder.data("commitId")
     form.find("#note_line_code").val dataHolder.data("lineCode")
+    form.find("#note_position").val dataHolder.attr("data-position")
     form.find("#note_noteable_type").val dataHolder.data("noteableType")
     form.find("#note_noteable_id").val dataHolder.data("noteableId")
     form.find('.js-note-discard')