Correct file-header spacing on compare page

Use special classes when is_compare, similar to is_commit. Default
expectation is diff is being viewed in MR

4 files changed, 6 insertions, 6 deletions

diff --git a/app/views/projects/commit/show.html.haml b/app/views/projects/commit/show.html.haml
index 06f0cd9675e..fe9a8ac4182 100644
--- a/app/views/projects/commit/show.html.haml
+++ b/app/views/projects/commit/show.html.haml
@@ -10,7 +10,7 @@
 .container-fluid{ class: [limited_container_width, container_class] }
   = render "commit_box"
   = render "ci_menu"
-  = render "projects/diffs/diffs", diffs: @diffs, environment: @environment, is_commit: true
+  = render "projects/diffs/diffs", diffs: @diffs, environment: @environment, diff_page_context: "is-commit"
 
   .limited-width-notes
     = render "shared/notes/notes_with_form", :autocomplete => true
diff --git a/app/views/projects/compare/show.html.haml b/app/views/projects/compare/show.html.haml
index b6bebbabed0..5774b48a054 100644
--- a/app/views/projects/compare/show.html.haml
+++ b/app/views/projects/compare/show.html.haml
@@ -8,7 +8,7 @@
 
   - if @commits.present?
     = render "projects/commits/commit_list"
-    = render "projects/diffs/diffs", diffs: @diffs, environment: @environment
+    = render "projects/diffs/diffs", diffs: @diffs, environment: @environment, diff_page_context: "is-compare"
   - else
     .card.bg-light
       .center
diff --git a/app/views/projects/diffs/_diffs.html.haml b/app/views/projects/diffs/_diffs.html.haml
index cc2d0d3b2d8..2dba3fcd664 100644
--- a/app/views/projects/diffs/_diffs.html.haml
+++ b/app/views/projects/diffs/_diffs.html.haml
@@ -2,7 +2,7 @@
 - show_whitespace_toggle = local_assigns.fetch(:show_whitespace_toggle, true)
 - can_create_note = !@diff_notes_disabled && can?(current_user, :create_note, diffs.project)
 - diff_files = diffs.diff_files
-- is_commit = local_assigns.fetch(:is_commit, false)
+- diff_page_context = local_assigns.fetch(:diff_page_context, nil)
 
 .content-block.oneline-block.files-changed.diff-files-changed.js-diff-files-changed
   .files-changed-inner
@@ -25,4 +25,4 @@
   = render 'projects/diffs/warning', diff_files: diffs
 
 .files{ data: { can_create_note: can_create_note } }
-  = render partial: 'projects/diffs/file', collection: diff_files, as: :diff_file, locals: { project: diffs.project, environment: environment, is_commit: is_commit }
+  = render partial: 'projects/diffs/file', collection: diff_files, as: :diff_file, locals: { project: diffs.project, environment: environment, diff_page_context: diff_page_context }
diff --git a/app/views/projects/diffs/_file.html.haml b/app/views/projects/diffs/_file.html.haml
index 5565ae1d98b..855b719dc45 100644
--- a/app/views/projects/diffs/_file.html.haml
+++ b/app/views/projects/diffs/_file.html.haml
@@ -1,11 +1,11 @@
 - environment = local_assigns.fetch(:environment, nil)
-- is_commit = local_assigns.fetch(:is_commit, false)
+- diff_page_context = local_assigns.fetch(:diff_page_context, nil)
 - file_hash = hexdigest(diff_file.file_path)
 - image_diff = diff_file.rich_viewer && diff_file.rich_viewer.partial_name == 'image'
 - image_replaced = diff_file.old_content_sha && diff_file.old_content_sha != diff_file.content_sha
 
 .diff-file.file-holder{ id: file_hash, data: diff_file_html_data(project, diff_file.file_path, diff_file.content_sha) }
-  .js-file-title.file-title-flex-parent{ class: is_commit ? "is-commit" : "" }
+  .js-file-title.file-title-flex-parent{ class: diff_page_context }
     .file-header-content
       = render "projects/diffs/file_header", diff_file: diff_file, url: "##{file_hash}"