1 files changed, 15 insertions, 0 deletions
diff --git a/app/helpers/blame_helper.rb b/app/helpers/blame_helper.rb
index 82c74e2416d..5117f7c6d9c 100644
--- a/app/helpers/blame_helper.rb
+++ b/app/helpers/blame_helper.rb
@@ -1,6 +1,13 @@
 # frozen_string_literal: true
 
 module BlameHelper
+  BODY_FONT_SIZE = "0.875rem"
+  COMMIT_LINE_HEIGHT = 3 # 150% * 2 lines of text
+  COMMIT_PADDING = "10px" # 5px from both top and bottom
+  COMMIT_BLOCK_HEIGHT_EXP = "(#{BODY_FONT_SIZE} * #{COMMIT_LINE_HEIGHT}) + #{COMMIT_PADDING}"
+  CODE_LINE_HEIGHT = 1.1875
+  CODE_PADDING = "20px" # 10px from both top and bottom
+
   def age_map_duration(blame_groups, project)
     now = Time.zone.now
     start_date = blame_groups.map { |blame_group| blame_group[:commit].committed_date }
@@ -24,4 +31,12 @@ module BlameHelper
       "blame-commit-age-#{age_group}"
     end
   end
+
+  def intrinsic_row_css(line_count)
+    # using rems here because the size of the row depends on the text size
+    # which can be customized via user agent styles and browser preferences
+    total_line_height_exp = "#{line_count * CODE_LINE_HEIGHT}rem + #{CODE_PADDING}"
+    row_height_exp = line_count == 1 ? COMMIT_BLOCK_HEIGHT_EXP : total_line_height_exp
+    "contain-intrinsic-size: 1px calc(#{row_height_exp})"
+  end
 end