6 files changed, 70 insertions, 5 deletions
diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 7dc97a8f9..8bcfb2fb1 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -680,6 +680,36 @@ div.issue .attribute.string_cf .value .wiki p {margin-top: 0; margin-bottom: 0;}
 div.issue .attribute.text_cf .value .wiki p:first-of-type {margin-top: 0;}
 div.issue.overdue .due-date .value { color: #c22; }
 body.controller-issues h2.inline-flex {padding-right: 0}
+div#sticky-issue-header {
+  display: none;
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  background-color: white;
+  border-bottom: 1px solid #d0d7de;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
+  font-size: 0.8125rem;
+  align-items: center;
+  z-index: 1000;
+  padding: 10px 6px;
+  border-radius: 0px;
+}
+div#sticky-issue-header.is-visible {
+  display: flex;
+}
+div#sticky-issue-header .issue-heading {
+  flex-shrink: 0;
+  white-space: nowrap;
+  margin-right: 6px;
+}
+div#sticky-issue-header .subject {
+  font-weight: bold;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  flex-grow: 1;
+}
 
 #issue_tree table.issues, #relations table.issues {border: 0;}
 #issue_tree table.issues td, #relations table.issues td {border: 0;}
diff --git a/app/assets/stylesheets/responsive.css b/app/assets/stylesheets/responsive.css
index c5278c87f..3a2eb46bb 100644
--- a/app/assets/stylesheets/responsive.css
+++ b/app/assets/stylesheets/responsive.css
@@ -848,6 +848,12 @@
     font-size: 1.1em;
     text-align: left;
   }
+
+  /* Sticky issue header */
+  /* When project-jump.drdn is visible in mobile layout, offset the sticky header by its height to prevent it from being hidden. */
+  div#sticky-issue-header {
+    top: 64px;
+  }
 }
 
 @media all and (max-width: 599px) {
diff --git a/app/controllers/versions_controller.rb b/app/controllers/versions_controller.rb
index d52b43ba3..328d3e56e 100644
--- a/app/controllers/versions_controller.rb
+++ b/app/controllers/versions_controller.rb
@@ -51,7 +51,7 @@ class VersionsController < ApplicationController
         if @selected_tracker_ids.any? && @versions.any?
           issues = Issue.visible.
             includes(:project, :tracker).
-            preload(:status, :priority, :fixed_version).
+            preload(:status, :priority, :fixed_version, {:assigned_to => :email_address}).
             where(:tracker_id => @selected_tracker_ids, :project_id => project_ids, :fixed_version_id => @versions.map(&:id)).
             order("#{Project.table_name}.lft, #{Tracker.table_name}.position, #{Issue.table_name}.id")
           @issues_by_version = issues.group_by(&:fixed_version)
@@ -69,7 +69,7 @@ class VersionsController < ApplicationController
       format.html do
         @issues = @version.fixed_issues.visible.
           includes(:status, :tracker, :priority).
-          preload(:project).
+          preload(:project, {:assigned_to => :email_address}).
           reorder("#{Tracker.table_name}.position, #{Issue.table_name}.id").
           to_a
       end
diff --git a/app/javascript/controllers/sticky_issue_header_controller.js b/app/javascript/controllers/sticky_issue_header_controller.js
new file mode 100644
index 000000000..aebc7d2dc
--- /dev/null
+++ b/app/javascript/controllers/sticky_issue_header_controller.js
@@ -0,0 +1,22 @@
+import { Controller } from "@hotwired/stimulus";
+
+export default class extends Controller {
+  static targets = ["original", "stickyHeader"];
+
+  connect() {
+    if (!this.originalTarget || !this.stickyHeaderTarget) return;
+
+    this.observer = new IntersectionObserver(
+      ([entry]) => {
+        this.stickyHeaderTarget.classList.toggle("is-visible", !entry.isIntersecting);
+      },
+      { threshold: 0 }
+    );
+
+    this.observer.observe(this.originalTarget);
+  }
+
+  disconnect() {
+    this.observer?.disconnect();
+  }
+}
diff --git a/app/models/version.rb b/app/models/version.rb
index 707ed59dc..3ca4f2bff 100644
--- a/app/models/version.rb
+++ b/app/models/version.rb
@@ -106,7 +106,7 @@ module FixedIssuesExtension
         done = self.open(open).sum do |c|
           estimated = c.total_estimated_hours.to_f
           estimated = estimated_average unless estimated > 0.0
-          ratio = c.closed? ? 100 : (c.done_ratio || 0)
+          ratio = open ? (c.done_ratio || 0) : 100
           estimated * ratio
         end
         progress = done / (estimated_average * issues_count)
diff --git a/app/views/issues/show.html.erb b/app/views/issues/show.html.erb
index 36111efa4..0a6da1098 100644
--- a/app/views/issues/show.html.erb
+++ b/app/views/issues/show.html.erb
@@ -37,9 +37,16 @@
     <%= assignee_avatar(@issue.assigned_to, :size => "22", :class => "gravatar-child") if @issue.assigned_to %>
   </div>
 
-<div class="subject">
-<%= render_issue_subject_with_tree(@issue) %>
+<div data-controller="sticky-issue-header">
+  <div class="subject" data-sticky-issue-header-target="original">
+    <%= render_issue_subject_with_tree(@issue) %>
+  </div>
+  <div id="sticky-issue-header" data-sticky-issue-header-target="stickyHeader" class="issue">
+    <span class="issue-heading"><%= issue_heading(@issue) %>:</span>
+    <span class="subject"><%= @issue.subject %></span>
+  </div>
 </div>
+
         <p class="author">
         <%= authoring @issue.created_on, @issue.author %>.
         <% if @issue.created_on != @issue.updated_on %>