Reimplement mechanism to open the config menu to a specific tab

include/recomp_ui.h

@@ -57,6 +57,17 @@ namespace recompui {
     ContextId get_config_sub_menu_context_id();
     ContextId get_close_prompt_context_id();
 
+    enum class ConfigTab {
+        General,
+        Controls,
+        Graphics,
+        Sound,
+        Mods,
+        Debug,
+    };
+
+    void set_config_tab(ConfigTab tab);
+
     enum class ButtonVariant {
         Primary,
         Secondary,

src/ui/ui_config.cpp

@@ -979,3 +979,44 @@ void recompui::open_prompt(
 bool recompui::is_prompt_open() {
 	return false;
 }
+
+void recompui::set_config_tab(ConfigTab tab) {
+    ContextId config_context = recompui::get_config_context_id();
+    
+    Rml::ElementDocument* doc = config_context.get_document();
+    assert(doc != nullptr);
+
+    Rml::Element* tabset_el = doc->GetElementById("config_tabset");
+    assert(tabset_el != nullptr);
+
+    Rml::ElementTabSet* tabset = rmlui_dynamic_cast<Rml::ElementTabSet*>(tabset_el);
+    assert(tabset != nullptr);
+
+    int tab_index = 0;
+
+    switch (tab) {
+        case ConfigTab::General:
+            tab_index = 0;
+            break;
+        case ConfigTab::Controls:
+            tab_index = 1;
+            break;
+        case ConfigTab::Graphics:
+            tab_index = 2;
+            break;
+        case ConfigTab::Sound:
+            tab_index = 3;
+            break;
+        case ConfigTab::Mods:
+            tab_index = 4;
+            break;
+        case ConfigTab::Debug:
+            tab_index = 5;
+            break;
+        default:
+            assert(false);
+            return;
+    }
+
+    tabset->SetActiveTab(tab_index);
+}

src/ui/ui_launcher.cpp

@@ -88,20 +88,23 @@ public:
         );
         recompui::register_event(listener, "open_controls",
             [](const std::string& param, Rml::Event& event) {
+                recompui::set_config_tab(recompui::ConfigTab::Controls);
                 recompui::hide_all_contexts();
-                recompui::show_context(recompui::get_config_context_id(), "controls");
+                recompui::show_context(recompui::get_config_context_id(), "");
             }
         );
         recompui::register_event(listener, "open_settings",
             [](const std::string& param, Rml::Event& event) {
+                recompui::set_config_tab(recompui::ConfigTab::General);
                 recompui::hide_all_contexts();
-                recompui::show_context(recompui::get_config_context_id(), "general");
+                recompui::show_context(recompui::get_config_context_id(), "");
             }
         );
         recompui::register_event(listener, "open_mods",
             [](const std::string &param, Rml::Event &event) {
+                recompui::set_config_tab(recompui::ConfigTab::Mods);
                 recompui::hide_all_contexts();
-                recompui::show_context(recompui::get_config_context_id(), "mods");
+                recompui::show_context(recompui::get_config_context_id(), "");
             }
         );
         recompui::register_event(listener, "exit_game",