Make the back button a functional link

framework/core/js/admin/src/initializers/boot.js

@@ -31,7 +31,10 @@ export default function boot(app) {
   app.alerts = m.mount(document.getElementById('alerts'), AlertManager.component());
   app.history = {
     canGoBack: () => true,
-    back: () => window.location = '/'
+    backUrl: () => app.forum.attribute('baseUrl'),
+    back: function() {
+      window.location = this.backUrl();
+    }
   };
 
   m.route.mode = 'hash';

framework/core/js/forum/src/utils/History.js

@@ -85,6 +85,17 @@ export default class History {
     m.route(this.getTop().url);
   }
 
+  /**
+   * Get the URL of the previous page.
+   *
+   * @public
+   */
+  backUrl() {
+    const secondTop = this.stack[this.stack.length - 2];
+
+    return secondTop.url;
+  }
+
   /**
    * Go to the first route in the history stack.
    *

framework/core/js/lib/components/Navigation.js

@@ -1,5 +1,6 @@
 import Component from 'flarum/Component';
 import Button from 'flarum/components/Button';
+import LinkButton from 'flarum/components/LinkButton';
 
 /**
  * The `Navigation` component displays a set of navigation buttons. Typically
@@ -47,10 +48,16 @@ export default class Navigation extends Component {
   getBackButton() {
     const {history} = app;
 
-    return Button.component({
+    return LinkButton.component({
       className: 'Button Button--icon Navigation-back',
-      onclick: history.back.bind(history),
-      icon: 'chevron-left'
+      href: history.backUrl(),
+      icon: 'chevron-left',
+      config: () => {},
+      onclick: e => {
+        if (e.shiftKey || e.ctrlKey || e.metaKey || e.which === 2) return;
+        e.preventDefault();
+        history.back();
+      }
     });
   }