Post-porting fixes for v3

flag_uint_slice.go

@@ -194,6 +194,15 @@ func (f *UintSliceFlag) stringify() string {
 	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
 }
 
+// RunAction executes flag action if set
+func (f *UintSliceFlag) RunAction(c *Context) error {
+	if f.Action != nil {
+		return f.Action(c, c.UintSlice(f.Name))
+	}
+
+	return nil
+}
+
 // UintSlice looks up the value of a local UintSliceFlag, returns
 // nil if not found
 func (cCtx *Context) UintSlice(name string) []uint {