Port #3911 from Citra: "Optimize settings application"

src/yuzu/configuration/configure_debug.cpp

@@ -44,5 +44,4 @@ void ConfigureDebug::applyConfiguration() {
     Log::Filter filter;
     filter.ParseFilterString(Settings::values.log_filter);
     Log::SetGlobalFilter(filter);
-    Settings::Apply();
 }

src/yuzu/configuration/configure_general.cpp

@@ -44,5 +44,4 @@ void ConfigureGeneral::applyConfiguration() {
     Settings::values.use_cpu_jit = ui->use_cpu_jit->isChecked();
     Settings::values.use_multi_core = ui->use_multi_core->isChecked();
     Settings::values.use_docked_mode = ui->use_docked_mode->isChecked();
-    Settings::Apply();
 }

src/yuzu/configuration/configure_graphics.cpp

@@ -67,5 +67,4 @@ void ConfigureGraphics::applyConfiguration() {
         ToResolutionFactor(static_cast<Resolution>(ui->resolution_factor_combobox->currentIndex()));
     Settings::values.toggle_framelimit = ui->toggle_framelimit->isChecked();
     Settings::values.use_accurate_framebuffers = ui->use_accurate_framebuffers->isChecked();
-    Settings::Apply();
 }

src/yuzu/configuration/configure_input.cpp

@@ -191,8 +191,6 @@ void ConfigureInput::applyConfiguration() {
                    [](const Common::ParamPackage& param) { return param.Serialize(); });
     std::transform(analogs_param.begin(), analogs_param.end(), Settings::values.analogs.begin(),
                    [](const Common::ParamPackage& param) { return param.Serialize(); });
-
-    Settings::Apply();
 }
 
 void ConfigureInput::loadConfiguration() {

src/yuzu/main.cpp

@@ -723,10 +723,12 @@ void GMainWindow::ToggleWindowMode() {
 
 void GMainWindow::OnConfigure() {
     ConfigureDialog configureDialog(this);
+    auto old_theme = UISettings::values.theme;
     auto result = configureDialog.exec();
     if (result == QDialog::Accepted) {
         configureDialog.applyConfiguration();
-        UpdateUITheme();
+        if (UISettings::values.theme != old_theme)
+            UpdateUITheme();
         config->Save();
     }
 }