Method isUnderline

src/server/web/public/terminal.js:3721–3723

()

            return 134217728 & this.fg;
          }
          isUnderline() {
            return this.hasExtendedAttrs() && 0 !== this.extended.underlineStyle ? 1 : 268435456 & this.fg;
          }
          isBlink() {
            return 536870912 & this.fg;
          }