Ladybird: Add "View Source" menu action (Ctrl+U)

Ladybird/BrowserWindow.cpp

@@ -9,6 +9,7 @@
 #include "WebView.h"
 #include <LibCore/EventLoop.h>
 #include <QAction>
+#include <QPlainTextEdit>
 #include <QStatusBar>
 
 extern String s_serenity_resource_root;
@@ -31,6 +32,24 @@ BrowserWindow::BrowserWindow(Core::EventLoop& event_loop)
     quit_action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_Q));
     menu->addAction(quit_action);
 
+    auto* inspect_menu = menuBar()->addMenu("&Inspect");
+
+    auto* view_source_action = new QAction("View &Source");
+    view_source_action->setIcon(QIcon(QString("%1/res/icons/16x16/filetype-html.png").arg(s_serenity_resource_root.characters())));
+    view_source_action->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_U));
+    inspect_menu->addAction(view_source_action);
+    QObject::connect(view_source_action, &QAction::triggered, this, [this] {
+        if (m_current_tab) {
+            auto source = m_current_tab->view().source();
+
+            auto* text_edit = new QPlainTextEdit;
+            text_edit->setFont(QFontDatabase::systemFont(QFontDatabase::SystemFont::FixedFont));
+            text_edit->resize(800, 600);
+            text_edit->setPlainText(source.characters());
+            text_edit->show();
+        }
+    });
+
     auto* debug_menu = menuBar()->addMenu("&Debug");
 
     auto* dump_dom_tree_action = new QAction("Dump DOM Tree");

Ladybird/WebView.cpp

@@ -664,3 +664,11 @@ void WebView::debug_request(String const& request, String const& argument)
             doc->window().local_storage()->dump();
     }
 }
+
+String WebView::source() const
+{
+    auto* document = m_page_client->page().top_level_browsing_context().active_document();
+    if (!document)
+        return String::empty();
+    return document->source();
+}

Ladybird/WebView.h

@@ -32,6 +32,8 @@ public:
 
     void debug_request(String const& request, String const& argument);
 
+    String source() const;
+
 signals:
     void linkHovered(QString, int timeout = 0);
     void linkUnhovered();