LibGUI: Fully support TabWidget in GML

TabWidgets couldn't be used in GML properly, as the GML creation
routines didn't actually call the necessary functions in the TabWidget
to get a new tab added. This commit fixes that by making the name of the
tab a normal property, the previously introduced "title", which can be
trivially set from GML. Therefore, try_add_widget() loses an argument
(while try_add_tab doesn't, because it newly constructs the widget).
This allows us to get rid of the silly "fixing my widget tree after the
fact" code in Help and will make it super easy to use TabWidget in
future GML. :^)

1 files changed, 8 insertions, 4 deletions

diff --git a/Userland/Applications/SystemMonitor/main.cpp b/Userland/Applications/SystemMonitor/main.cpp
index e3f96643b1..7df0eaa925 100644
--- a/Userland/Applications/SystemMonitor/main.cpp
+++ b/Userland/Applications/SystemMonitor/main.cpp
@@ -168,16 +168,20 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     auto& process_table_container = tabwidget.add_tab<GUI::Widget>("Processes");
 
     auto performance_widget = build_performance_tab();
-    tabwidget.add_widget("Performance", performance_widget);
+    performance_widget->set_title("Performance");
+    tabwidget.add_widget(performance_widget);
 
     auto storage_widget = build_storage_widget();
-    tabwidget.add_widget("Storage", storage_widget);
+    storage_widget->set_title("Storage");
+    tabwidget.add_widget(storage_widget);
 
     auto network_stats_widget = NetworkStatisticsWidget::construct();
-    tabwidget.add_widget("Network", network_stats_widget);
+    network_stats_widget->set_title("Network");
+    tabwidget.add_widget(network_stats_widget);
 
     auto hardware_widget = build_hardware_tab();
-    tabwidget.add_widget("Hardware", hardware_widget);
+    hardware_widget->set_title("Hardware");
+    tabwidget.add_widget(hardware_widget);
 
     process_table_container.set_layout<GUI::VerticalBoxLayout>();
     process_table_container.layout()->set_margins(4);