Change issue new? behavior

Issues that are less than 24 hours old are new now.
Also it does not matter if creation and edit dates are different.
Use `new?` instead of `today?` for UI highligt of new issues.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/helpers/issues_helper.rb

@@ -4,7 +4,7 @@ module IssuesHelper
   def issue_css_classes(issue)
     classes = ["issue"]
     classes << "closed" if issue.closed?
-    classes << "today" if issue.today?
+    classes << "today" if issue.new?
     classes << "user-can-drag" if @sort == 'relative_position'
     classes.join(' ')
   end

app/models/concerns/issuable.rb

@@ -385,8 +385,12 @@ module Issuable
     Date.today == created_at.to_date
   end
 
+  def created_hours_ago
+    (Time.now.utc.to_i - created_at.utc.to_i) / 3600
+  end
+
   def new?
-    today? && created_at == updated_at
+    created_hours_ago < 24
   end
 
   def open?

changelogs/unreleased/dz-improve-new-issue-highlight.yml

+---
+title: Change logic behind new issues highlight
+merge_request: 41150
+author:
+type: changed

spec/models/concerns/issuable_spec.rb

@@ -295,20 +295,14 @@ RSpec.describe Issuable do
   end
 
   describe "#new?" do
-    it "returns true when created today and record hasn't been updated" do
-      allow(issue).to receive(:today?).and_return(true)
-      expect(issue.new?).to be_truthy
-    end
-
-    it "returns false when not created today" do
-      allow(issue).to receive(:today?).and_return(false)
+    it "returns false when created 30 hours ago" do
+      allow(issue).to receive(:created_at).and_return(Time.current - 30.hours)
       expect(issue.new?).to be_falsey
     end
 
-    it "returns false when record has been updated" do
-      allow(issue).to receive(:today?).and_return(true)
-      issue.update_attribute(:updated_at, 1.hour.ago)
-      expect(issue.new?).to be_falsey
+    it "returns true when created 20 hours ago" do
+      allow(issue).to receive(:created_at).and_return(Time.current - 20.hours)
+      expect(issue.new?).to be_truthy
     end
   end