app: add support to hidden minimize and maximize buttons on macos and …

[kkeybbs]

Two options app.HiddenMinimizeButton and app.HiddenMaximizeButton are added to create a window without minimize or/and maximize buttons.

hide both minimize and maximize buttons

w := new(app.Window)
w.Option(app.HiddenMinimizeButton(true), app.HiddenMaximizeButton(true))

hide minimize button, keep maximize button:

w := new(app.Window)
w.Option(app.HiddenMinimizeButton(true), app.HiddenMaximizeButton(false))

• on macOS:

• on Windows: