Corrected the callback variable name for consistency

app/app.go

@@ -148,7 +148,7 @@ func newAppWithDriver(d fyne.Driver, id string) fyne.App {
 	fyne.SetCurrentApp(newApp)
 
 	newApp.prefs = newApp.newDefaultPreferences()
-	newApp.lifecycle.(*app.Lifecycle).SetAfterStopped(func() {
+	newApp.lifecycle.(*app.Lifecycle).SetOnStoppedHookExecuted(func() {
 		if prefs, ok := newApp.prefs.(*preferences); ok {
 			prefs.forceImmediateSave()
 		}

app/preferences.go

@@ -62,7 +62,6 @@ func (p *preferences) saveToFile(path string) error {
 	p.savedRecently = true
 	p.prefLock.Unlock()
 	defer p.resetSavedRecently()
-
 	err := os.MkdirAll(filepath.Dir(path), 0700)
 	if err != nil { // this is not an exists error according to docs
 		return err

internal/app/lifecycle.go

@@ -17,13 +17,13 @@ type Lifecycle struct {
 	onStarted    atomic.Value // func()
 	onStopped    atomic.Value // func()
 
-	internalAfterStoppedTrigger atomic.Value // func()
+	onStoppedHookExecuted atomic.Value // func()
 }
 
-// SetAfterStopped is an internal function that lets Fyne schedule a clean-up after
+// SetOnStoppedHookExecuted is an internal function that lets Fyne schedule a clean-up after
 // the user-provided stopped hook.
-func (l *Lifecycle) SetAfterStopped(f func()) {
-	l.internalAfterStoppedTrigger.Store(f)
+func (l *Lifecycle) SetOnStoppedHookExecuted(f func()) {
+	l.onStoppedHookExecuted.Store(f)
 }
 
 // SetOnEnteredForeground hooks into the the app becoming foreground.
@@ -79,7 +79,7 @@ func (l *Lifecycle) TriggerStopped() {
 	if ff, ok := f.(func()); ok && ff != nil {
 		ff()
 	}
-	f = l.internalAfterStoppedTrigger.Load()
+	f = l.onStoppedHookExecuted.Load()
 	if ff, ok := f.(func()); ok && ff != nil {
 		ff()
 	}