UI+WebContent: Add menu option to dump display list

Author: https://github.com/kalenikaliaksandr
Commit: f65db4507a
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5390
Reviewed-by: https://github.com/gmta ✅

Services/WebContent/ConnectionFromClient.cpp

@@ -253,6 +253,14 @@ void ConnectionFromClient::debug_request(u64 page_id, ByteString request, ByteSt
         Web::dump_tree(*traversable);
     }
 
+    if (request == "dump-display-list") {
+        if (auto* doc = page->page().top_level_browsing_context().active_document()) {
+            auto display_list_dump = doc->dump_display_list();
+            dbgln("{}", display_list_dump);
+        }
+        return;
+    }
+
     if (request == "dump-dom-tree") {
         if (auto* doc = page->page().top_level_browsing_context().active_document())
             Web::dump_tree(*doc);

UI/AppKit/Application/ApplicationDelegate.mm

@@ -640,6 +640,9 @@
     [submenu addItem:[[NSMenuItem alloc] initWithTitle:@"Dump Stacking Context Tree"
                                                 action:@selector(dumpStackingContextTree:)
                                          keyEquivalent:@""]];
+    [submenu addItem:[[NSMenuItem alloc] initWithTitle:@"Dump Display List"
+                                                action:@selector(dumpDisplayList:)
+                                         keyEquivalent:@""]];
     [submenu addItem:[[NSMenuItem alloc] initWithTitle:@"Dump Style Sheets"
                                                 action:@selector(dumpStyleSheets:)
                                          keyEquivalent:@""]];

UI/AppKit/Interface/TabController.mm

@@ -346,6 +346,11 @@ static NSString* const TOOLBAR_TAB_OVERVIEW_IDENTIFIER = @"ToolbarTabOverviewIde
     [self debugRequest:"dump-dom-tree" argument:""];
 }
 
+- (void)dumpDisplayList:(id)sender
+{
+    [self debugRequest:"dump-display-list" argument:""];
+}
+
 - (void)dumpLayoutTree:(id)sender
 {
     [self debugRequest:"dump-layout-tree" argument:""];

UI/Qt/BrowserWindow.cpp

@@ -402,6 +402,13 @@ BrowserWindow::BrowserWindow(Vector<URL::URL> const& initial_urls, IsPopupWindow
         debug_request("dump-stacking-context-tree");
     });
 
+    auto* dump_display_list = new QAction("Dump Display List", this);
+    dump_display_list->setIcon(load_icon_from_uri("resource://icons/16x16/layout.png"sv));
+    debug_menu->addAction(dump_display_list);
+    QObject::connect(dump_display_list, &QAction::triggered, this, [this] {
+        debug_request("dump-display-list");
+    });
+
     auto* dump_style_sheets_action = new QAction("Dump &Style Sheets", this);
     dump_style_sheets_action->setIcon(load_icon_from_uri("resource://icons/16x16/filetype-css.png"sv));
     debug_menu->addAction(dump_style_sheets_action);