Merge branch 'diff-link-fix' into 'master'

Diff highlight fixes

This fixes a couple of issues with linking/highlight diff lines:

- Fixed issue with lines not being selectable when expanding diff
- Fixed issue with incorrect line being highlighted if line is in discussion view

See merge request !3725

app/assets/javascripts/merge_request_tabs.js.coffee

@@ -87,8 +87,8 @@ class @MergeRequestTabs
     if window.location.hash
       navBarHeight = $('.navbar-gitlab').outerHeight()
 
-      $el = $("#{container} #{window.location.hash}")
-      $.scrollTo("#{container} #{window.location.hash}", offset: -navBarHeight) if $el.length
+      $el = $("#{container} #{window.location.hash}:not(.match)")
+      $.scrollTo("#{container} #{window.location.hash}:not(.match)", offset: -navBarHeight) if $el.length
 
   # Activate a tab based on the current action
   activateTab: (action) ->
@@ -176,12 +176,12 @@ class @MergeRequestTabs
 
     if locationHash isnt ''
       hashClassString = ".#{locationHash.replace('#', '')}"
-      $diffLine = $(locationHash)
+      $diffLine = $("#{locationHash}:not(.match)", $('#diffs'))
 
-      if $diffLine.is ':not(tr)'
-        $diffLine = $("td#{locationHash}, td#{hashClassString}")
+      if not $diffLine.is 'tr'
+        $diffLine = $('#diffs').find("td#{locationHash}, td#{hashClassString}")
       else
-        $diffLine = $('td', $diffLine)
+        $diffLine = $diffLine.find('td')
 
       if $diffLine.length
         $diffLine.addClass 'hll'

app/views/projects/blob/diff.html.haml

 - if @lines.present?
   - if @form.unfold? && @form.since != 1 && !@form.bottom?
-    %tr.line_holder{ id: @form.since }
+    %tr.line_holder
       = render "projects/diffs/match_line", { line: @match_line,
         line_old: @form.since, line_new: @form.since, bottom: false, new_file: false }
 
   - @lines.each_with_index do |line, index|
     - line_new = index + @form.since
     - line_old = line_new - @form.offset
-    %tr.line_holder
+    %tr.line_holder{ id: line_old }
       %td.old_line.diff-line-num{ data: { linenumber: line_old } }
-        = link_to raw(line_old), "#"
+        = link_to raw(line_old), "##{line_old}"
       %td.new_line.diff-line-num{ data: { linenumber: line_old } }
-        = link_to raw(line_new) , "#"
+        = link_to raw(line_new) , "##{line_old}"
       %td.line_content.noteable_line==#{' ' * @form.indent}#{line}
 
   - if @form.unfold? && @form.bottom? && @form.to < @blob.loc