Settings: Write the alternative speeds back only when they're changed

The percentages were converted back to frame rates whenever any dialog
closed with OK. That overwrote the values Restore Defaults had just set,
and the integer rounding drifted unchanged values down (100 fps became 99
on any unrelated change). Restoring defaults also had the old reporting
choice written back on exit; it's now re-read too.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

UI/GameSettingsScreen.cpp

@@ -118,14 +118,19 @@ GameSettingsScreen::GameSettingsScreen(const Path &gamePath, std::string gameID,
 	: UITabbedBaseDialogScreen(gamePath, &g_Config.iSettingsCurrentTab, TabDialogFlags::HorizontalOnlyIcons | TabDialogFlags::VerticalShowIcons), gameID_(gameID), editGameSpecificThenRestore_(editThenRestore) {
 	prevInflightFrames_ = g_Config.iInflightFrames;
 	analogSpeedMapped_ = KeyMap::InputMappingsFromPspButton(VIRTKEY_SPEED_ANALOG, nullptr, true);
-	// Written back on exit, so it must be read even if the System tab is never opened.
-	enableReports_ = Reporting::IsEnabled();
 
 	if (editGameSpecificThenRestore_) {
 		std::shared_ptr<GameInfo> info = g_gameInfoCache->GetInfo(nullptr, gamePath_, GameInfoFlags::PARAM_SFO);
 		g_Config.LoadGameConfig(gameID_);
 	}
 
+	ReadConfigTemporaries();
+}
+
+// Also called after restoring defaults, so the old values aren't written back over them.
+void GameSettingsScreen::ReadConfigTemporaries() {
+	// Written back on exit, so it must be read even if the System tab is never opened.
+	enableReports_ = Reporting::IsEnabled();
 	iAlternateSpeedPercent1_ = g_Config.iFpsLimit1 < 0 ? -1 : (g_Config.iFpsLimit1 * 100) / 60;
 	iAlternateSpeedPercent2_ = g_Config.iFpsLimit2 < 0 ? -1 : (g_Config.iFpsLimit2 * 100) / 60;
 	iAlternateSpeedPercentAnalog_ = (g_Config.iAnalogFpsLimit * 100) / 60;
@@ -466,15 +471,24 @@ void GameSettingsScreen::CreateGraphicsSettings(UI::ViewGroup *graphicsSettings)
 	altSpeed1->SetFormat("%i%%");
 	altSpeed1->SetZeroLabel(gr->T("Unlimited"));
 	altSpeed1->SetNegativeDisable(gr->T("Disabled"));
+	altSpeed1->OnChange.Add([this](UI::EventParams &) {
+		g_Config.iFpsLimit1 = iAlternateSpeedPercent1_ < 0 ? -1 : (iAlternateSpeedPercent1_ * 60) / 100;
+	});
 
 	PopupSliderChoice *altSpeed2 = graphicsSettings->Add(new PopupSliderChoice(&iAlternateSpeedPercent2_, 0, 1000, UI::NO_DEFAULT_INT, gr->T("Alternative Speed 2", "Alternative speed 2 (in %, 0 = unlimited)"), 5, screenManager(), gr->T("%, 0:unlimited")));
 	altSpeed2->SetFormat("%i%%");
 	altSpeed2->SetZeroLabel(gr->T("Unlimited"));
 	altSpeed2->SetNegativeDisable(gr->T("Disabled"));
+	altSpeed2->OnChange.Add([this](UI::EventParams &) {
+		g_Config.iFpsLimit2 = iAlternateSpeedPercent2_ < 0 ? -1 : (iAlternateSpeedPercent2_ * 60) / 100;
+	});
 
 	if (analogSpeedMapped_) {
 		PopupSliderChoice *analogSpeed = graphicsSettings->Add(new PopupSliderChoice(&iAlternateSpeedPercentAnalog_, 1, 1000, UI::NO_DEFAULT_INT, gr->T("Analog alternative speed", "Analog alternative speed (in %)"), 5, screenManager(), "%"));
 		analogSpeed->SetFormat("%i%%");
+		analogSpeed->OnChange.Add([this](UI::EventParams &) {
+			g_Config.iAnalogFpsLimit = (iAlternateSpeedPercentAnalog_ * 60) / 100;
+		});
 	}
 
 	graphicsSettings->Add(new ItemHeader(gr->T("Speed Hacks", "Speed Hacks (can cause rendering errors!)")));
@@ -1672,9 +1686,9 @@ void GameSettingsScreen::dialogFinished(const Screen *dialog, DialogResult resul
 	}
 
 	if (result == DialogResult::DR_OK) {
-		g_Config.iFpsLimit1 = iAlternateSpeedPercent1_ < 0 ? -1 : (iAlternateSpeedPercent1_ * 60) / 100;
-		g_Config.iFpsLimit2 = iAlternateSpeedPercent2_ < 0 ? -1 : (iAlternateSpeedPercent2_ * 60) / 100;
-		g_Config.iAnalogFpsLimit = (iAlternateSpeedPercentAnalog_ * 60) / 100;
+		if (equals(dialog->tag(), "RestoreSettingsScreen")) {
+			ReadConfigTemporaries();
+		}
 		recreate = true;
 	}
 
@@ -1798,6 +1812,7 @@ void GameSettingsScreen::OnAudioDevice(UI::EventParams &e) {
 void GameSettingsScreen::CallbackRestoreDefaults(bool yes) {
 	if (yes) {
 		g_Config.RestoreDefaults(RestoreSettingsBits::SETTINGS);
+		ReadConfigTemporaries();
 	}
 	System_Notify(SystemNotification::UI);
 }