FIX] web: allow section and subsection in report

In 10.0 having a `section`, `subsection` or `subsubsection` on a footer
element would replace the content with the page top three level of
headings.

This was removed in 11.0 with b446930 after which only `page` (current
page number) and `pages` (total number of page) classes would work.

This commit reintroduces the above-mentionned classes.

opw-2226700

X-original-commit: 14c6b94
Co-authored-by: Nicolas Lempereur <nle@odoo.com>

addons/web/views/report_templates.xml

@@ -114,14 +114,15 @@
                                 var z = x[i].split('=', 2);
                                 vars[z[0]] = unescape(z[1]);
                             }
-                            var fromPage = document.getElementsByClassName('page');
-                            for(var j = 0; j<fromPage.length; j++)
-                                fromPage[j].textContent = vars['sitepage'];
-                            var toPage = document.getElementsByClassName('topage');
-                            for(var j = 0; j<toPage.length; j++)
-                                toPage[j].textContent = vars['sitepages'];
-
-                            var index = vars['webpage'].split('.', 4)[3]
+                            var x = ['sitepage', 'sitepages', 'section', 'subsection', 'subsubsection'];
+                            var z = {'sitepage': 'page', 'sitepages': 'topage'};
+                            for (var i in x) {
+                                var y = document.getElementsByClassName(z[x[i]] || x[i])
+                                for (var j=0; j<y.length; ++j)
+                                    y[j].textContent = vars[x[i]];
+                            }
+
+                            var index = vars['webpage'].split('.', 4)[3];
                             var header = document.getElementById('minimal_layout_report_headers');
                             if(header !== null){
                                 var companyHeader = header.children[index];