From f17209d4384974c0cae4f3ca285f87ee1acce71b Mon Sep 17 00:00:00 2001
From: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Date: Tue, 13 Apr 2021 14:24:52 +0200
Subject: [PATCH] Backport PR #40761: DOC: collapse subpages in sidebar for API
 reference docs

---
 doc/_templates/sidebar-nav-bs.html | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 doc/_templates/sidebar-nav-bs.html

diff --git a/doc/_templates/sidebar-nav-bs.html b/doc/_templates/sidebar-nav-bs.html
new file mode 100644
index 0000000000000..7e0043e771e72
--- /dev/null
+++ b/doc/_templates/sidebar-nav-bs.html
@@ -0,0 +1,9 @@
+<nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
+  <div class="bd-toc-item active">
+    {% if pagename.startswith("reference") %}
+    {{ generate_nav_html("sidebar", maxdepth=4, collapse=True, includehidden=True, titles_only=True) }}
+    {% else %}
+    {{ generate_nav_html("sidebar", maxdepth=4, collapse=False, includehidden=True, titles_only=True) }}
+    {% endif %}
+  </div>
+</nav>