[BUG] "Required" FieldFlag prints as "ReadOnly"

[zacharysyoung]

Description

The String() method on FieldFlag has the word "ReadOnly" duplicated in its output, and it's missing the text "Required".

Consider running the following code in the UniDoc playground:

package main

import (
    "fmt"

    "github.com/unidoc/unipdf/v3/model"
)

func main() {
    var fflags model.FieldFlag
    fflags = fflags.Set(model.FieldFlagReadOnly)
    fflags = fflags.Set(model.FieldFlagRequired)
    fmt.Printf(" Flags: %s (%d)\n", fflags, fflags)
}

Expected Behavior

Flags: ReadOnly|Required (3)

Actual Behavior

Flags: ReadOnly|ReadOnly (3)

In the obfuscated code, I can see that the unicode-literal "ReadOnly" ("\u007cR\u0065\u0061\u0064\u004f\u006e\u006cy") is appended twice:

if _cafgf &FieldFlagReadOnly > 0{_edda +="\u007cR\u0065\u0061\u0064\u004f\u006e\u006cy";};if _cafgf &FieldFlagRequired > 0{_edda +="\u007cR\u0065\u0061\u0064\u004f\u006e\u006cy";

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[sampila]

Hi @zacharysyoung,

Thank you for reporting this issue, we made a release to fix this issue. v3.35.0 https://github.com/unidoc/unipdf-src/releases/tag/v3.35.0