Fix:(issue_1826) Make IsSet work with persistent flags

command.go

@@ -459,7 +459,7 @@ func (cmd *Command) Run(ctx context.Context, osArgs []string) (deferErr error) {
 
 	tracef("running flag actions (cmd=%[1]q)", cmd.Name)
 
-	if err := runFlagActions(ctx, cmd, cmd.appliedFlags); err != nil {
+	if err := cmd.runFlagActions(ctx); err != nil {
 		return err
 	}
 
@@ -1014,19 +1014,34 @@ func hasCommand(commands []*Command, command *Command) bool {
 	return false
 }
 
-func runFlagActions(ctx context.Context, cmd *Command, flags []Flag) error {
-	for _, fl := range flags {
+func (cmd *Command) runFlagActions(ctx context.Context) error {
+
+	for _, fl := range cmd.appliedFlags {
 		isSet := false
 
+		// check only local flagset for running local flag actions
 		for _, name := range fl.Names() {
-			if cmd.IsSet(name) {
-				isSet = true
+			cmd.flagSet.Visit(func(f *flag.Flag) {
+				if f.Name == name {
+					isSet = true
+				}
+			})
+			if isSet {
 				break
 			}
 		}
 
+		// If the flag hasnt been set on cmd line then we need to further
+		// check if it has been set via other means. If however it has
+		// been set by other means but it is persistent(and not set via current cmd)
+		// do not run the flag action
 		if !isSet {
-			continue
+			if !fl.IsSet() {
+				continue
+			}
+			if pf, ok := fl.(PersistentFlag); ok && pf.IsPersistent() {
+				continue
+			}
 		}
 
 		if af, ok := fl.(ActionableFlag); ok {

command_test.go

@@ -2588,6 +2588,8 @@ func TestWhenExitSubCommandWithCodeThenCommandQuitUnexpectedly(t *testing.T) {
 }
 
 func buildMinimalTestCommand() *Command {
+	// reset the help flag because tests may have set it
+	HelpFlag.(*BoolFlag).hasBeenSet = false
 	return &Command{Writer: io.Discard}
 }
 
@@ -3055,6 +3057,44 @@ func TestPersistentFlag(t *testing.T) {
 	}
 }
 
+func TestPersistentFlagIsSet(t *testing.T) {
+
+	result := ""
+	resultIsSet := false
+
+	app := &Command{
+		Name: "root",
+		Flags: []Flag{
+			&StringFlag{
+				Name:       "result",
+				Persistent: true,
+			},
+		},
+		Commands: []*Command{
+			{
+				Name: "sub",
+				Action: func(_ context.Context, cmd *Command) error {
+					result = cmd.String("result")
+					resultIsSet = cmd.IsSet("result")
+					return nil
+				},
+			},
+		},
+	}
+
+	r := require.New(t)
+
+	err := app.Run(context.Background(), []string{"root", "--result", "before", "sub"})
+	r.NoError(err)
+	r.Equal("before", result)
+	r.True(resultIsSet)
+
+	err = app.Run(context.Background(), []string{"root", "sub", "--result", "after"})
+	r.NoError(err)
+	r.Equal("after", result)
+	r.True(resultIsSet)
+}
+
 func TestFlagDuplicates(t *testing.T) {
 	tests := []struct {
 		name        string

flag_impl.go

@@ -180,6 +180,7 @@ func (f *FlagBase[T, C, V]) Apply(set *flag.FlagSet) error {
 				if err := f.value.Set(val); err != nil {
 					return err
 				}
+				f.hasBeenSet = true
 				if f.Validator != nil {
 					if v, ok := f.value.Get().(T); !ok {
 						return &typeError[T]{