configuration: Document odd widget cases

Explain why we need to do things differently at times, to serve as a
reference.

src/yuzu/configuration/configure_audio.cpp

@@ -49,6 +49,7 @@ void ConfigureAudio::Setup() {
     for (auto* setting : settings) {
         auto* widget = [&]() {
             if (setting->Id() == Settings::values.volume.Id()) {
+                // volume needs to be a slider (default is line edit)
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::Slider, true, 1.0f, nullptr,
@@ -56,6 +57,7 @@ void ConfigureAudio::Setup() {
             } else if (setting->Id() == Settings::values.audio_output_device_id.Id() ||
                        setting->Id() == Settings::values.audio_input_device_id.Id() ||
                        setting->Id() == Settings::values.sink_id.Id()) {
+                // These need to be unmanaged comboboxes, so we can populate them ourselves
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::ComboBox, false);
@@ -79,6 +81,8 @@ void ConfigureAudio::Setup() {
             connect(sink_combo_box, qOverload<int>(&QComboBox::currentIndexChanged), this,
                     &ConfigureAudio::UpdateAudioDevices);
         } else if (setting->Id() == Settings::values.audio_output_device_id.Id()) {
+            // Keep track of output (and input) device comboboxes to populate them with system
+            // devices, which are determined at run time
             output_device_combo_box = widget->combobox;
         } else if (setting->Id() == Settings::values.audio_input_device_id.Id()) {
             input_device_combo_box = widget->combobox;

src/yuzu/configuration/configure_cpu.cpp

@@ -58,9 +58,11 @@ void ConfigureCpu::Setup() {
         }
 
         if (setting->Id() == Settings::values.cpu_accuracy.Id()) {
+            // Keep track of cpu_accuracy combobox to display/hide the unsafe settings
             accuracy_layout->addWidget(widget);
             accuracy_combobox = widget->combobox;
         } else {
+            // Presently, all other settings here are unsafe checkboxes
             unsafe_hold.insert({setting->GetLabel(), widget});
         }
     }

src/yuzu/configuration/configure_graphics.cpp

@@ -231,6 +231,7 @@ void ConfigureGraphics::Setup() {
 
     for (const auto setting : Settings::values.linkage.by_category[Settings::Category::Renderer]) {
         ConfigurationShared::Widget* widget = [&]() {
+            // Set managed to false on these and set up the comboboxes ourselves
             if (setting->Id() == Settings::values.vulkan_device.Id() ||
                 setting->Id() == Settings::values.shader_backend.Id() ||
                 setting->Id() == Settings::values.vsync_mode.Id()) {
@@ -238,11 +239,13 @@ void ConfigureGraphics::Setup() {
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::ComboBox, false);
             } else if (setting->Id() == Settings::values.fsr_sharpening_slider.Id()) {
+                // FSR needs a reversed slider
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::ReverseSlider, true, 0.5f, nullptr,
                     tr("%1%", "FSR sharpening percentage (e.g. 50%)"));
             } else if (setting->Id() == Settings::values.speed_limit.Id()) {
+                // speed_limit needs a checkbox to set use_speed_limit, as well as a spinbox
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::SpinBox, true, 1.0f,
@@ -269,18 +272,23 @@ void ConfigureGraphics::Setup() {
                                  [=](bool) { UpdateAPILayout(); });
 
                 // Detach API's restore button and place it where we want
+                // Lets us put it on the side, and it will automatically scale if there's a second
+                // combobox (shader_backend, vulkan_device)
                 widget->layout()->removeWidget(api_restore_global_button);
                 api_layout->addWidget(api_restore_global_button);
             }
         } else if (setting->Id() == Settings::values.vulkan_device.Id()) {
+            // Keep track of vulkan_device's combobox so we can populate it
             hold_api.push_front(widget);
             vulkan_device_combobox = widget->combobox;
             vulkan_device_widget = widget;
         } else if (setting->Id() == Settings::values.shader_backend.Id()) {
+            // Keep track of shader_backend's combobox so we can populate it
             hold_api.push_front(widget);
             shader_backend_combobox = widget->combobox;
             shader_backend_widget = widget;
         } else if (setting->Id() == Settings::values.vsync_mode.Id()) {
+            // Keep track of vsync_mode's combobox so we can populate it
             vsync_mode_combobox = widget->combobox;
             hold_graphics.emplace(setting->Id(), widget);
         } else {
@@ -296,6 +304,8 @@ void ConfigureGraphics::Setup() {
         api_grid_layout->addWidget(widget);
     }
 
+    // Background color is too specific to build into the new system, so we manage it here
+    // (3 settings, all collected into a single widget with a QColor to manage on top)
     if (Settings::IsConfiguringGlobal()) {
         apply_funcs.push_front([this](bool powered_on) {
             Settings::values.bg_red.SetValue(static_cast<u8>(bg_color.red()));

src/yuzu/configuration/configure_graphics_advanced.cpp

@@ -45,6 +45,7 @@ void ConfigureGraphicsAdvanced::SetConfiguration() {
 
         hold.emplace(setting->Id(), widget);
 
+        // Keep track of enable_compute_pipelines so we can display it when needed
         if (setting->Id() == Settings::values.enable_compute_pipelines.Id()) {
             checkbox_enable_compute_pipelines = widget;
         }

src/yuzu/configuration/configure_system.cpp

@@ -126,11 +126,15 @@ void ConfigureSystem::Setup() {
         [[maybe_unused]] std::string label = setting->GetLabel();
         ConfigurationShared::Widget* widget = [=]() {
             if (setting->Id() == Settings::values.custom_rtc.Id()) {
+                // custom_rtc needs a DateTimeEdit (default is LineEdit), and a checkbox to manage
+                // it and custom_rtc_enabled
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::DateTimeEdit, true, 1.0f,
                     &Settings::values.custom_rtc_enabled);
             } else if (setting->Id() == Settings::values.rng_seed.Id()) {
+                // rng_seed needs a HexEdit (default is LineEdit), and a checkbox to manage
+                // it and rng_seed_enabled
                 return new ConfigurationShared::Widget(
                     setting, translations, combobox_translations, this, runtime_lock, apply_funcs,
                     ConfigurationShared::RequestType::HexEdit, true, 1.0f,
@@ -147,17 +151,20 @@ void ConfigureSystem::Setup() {
         }
 
         if (setting->Id() == Settings::values.rng_seed.Id()) {
+            // Keep track of rng_seed's widgets to reset it with the checkbox state
             rng_seed_checkbox = widget->checkbox;
             rng_seed_edit = widget->line_edit;
 
             rng_seed_edit->setEnabled(Settings::values.rng_seed_enabled.GetValue());
         } else if (setting->Id() == Settings::values.custom_rtc.Id()) {
+            // Keep track of custom_rtc's widgets to reset it with the checkbox state
             custom_rtc_checkbox = widget->checkbox;
             custom_rtc_edit = widget->date_time_edit;
 
             custom_rtc_edit->setEnabled(Settings::values.custom_rtc_enabled.GetValue());
         } else if (setting->Id() == Settings::values.region_index.Id()) {
-
+            // Keep track of the region_index (and langauge_index) combobox to validate the selected
+            // settings
             combo_region = widget->combobox;
         } else if (setting->Id() == Settings::values.language_index.Id()) {
             combo_language = widget->combobox;