[gtk/ebassi/gidocgen: 493/500] docs: Show class hierarchy in the API references

[Emmanuele Bassi <ebassi src gnome org>]

commit 90cf6bb686fce15dad981eb86215495242afcf48
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Mar 4 17:42:59 2021 +0000

    docs: Show class hierarchy in the API references

 docs/reference/gdk/gdk4.toml.in | 1 +
 docs/reference/gsk/gsk4.toml.in | 1 +
 docs/reference/gtk/gtk4.toml.in | 1 +
 3 files changed, 3 insertions(+)
---
diff --git a/docs/reference/gdk/gdk4.toml.in b/docs/reference/gdk/gdk4.toml.in
index 0d7d111da7..93f9b4f7f8 100644
--- a/docs/reference/gdk/gdk4.toml.in
+++ b/docs/reference/gdk/gdk4.toml.in
@@ -38,6 +38,7 @@ devhelp = true
 [theme]
 name = "basic"
 show_index_summary = true
+show_class_hierarchy = true
 
 [source-location]
 base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/master/";
diff --git a/docs/reference/gsk/gsk4.toml.in b/docs/reference/gsk/gsk4.toml.in
index 047e5498d7..1977bf0a8a 100644
--- a/docs/reference/gsk/gsk4.toml.in
+++ b/docs/reference/gsk/gsk4.toml.in
@@ -33,6 +33,7 @@ devhelp = true
 [theme]
 name = "basic"
 show_index_summary = true
+show_class_hierarchy = true
 
 [source-location]
 base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/master/";
diff --git a/docs/reference/gtk/gtk4.toml.in b/docs/reference/gtk/gtk4.toml.in
index 4c5ca3c5e5..4f8737bf6e 100644
--- a/docs/reference/gtk/gtk4.toml.in
+++ b/docs/reference/gtk/gtk4.toml.in
@@ -38,6 +38,7 @@ devhelp = true
 [theme]
 name = "basic"
 show_index_summary = true
+show_class_hierarchy = true
 
 [source-location]
 base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/master/";