provide support for ShowMode in SwitchTo and Cancel widgets #350

[lubaskinc0de]

Close issue #350, now users can pass show_mode argument to Cancel and SwitchTo widgets

third_window = Window(
    "Third Window",
    Cancel(Const("Back"), show_mode=ShowMode.DELETE_AND_SEND),
    state=SecondSG.main,
)

second_dialog = Dialog(third_window)

second_window = Window(
    "Second",
    SwitchTo(Const("To first"), state=MySG.first, id="to_first"),
    state=MySG.second,
)

first_window = Window(
    "First",
    SwitchTo(Const("To second"), state=MySG.second, id="to_second", show_mode=ShowMode.SEND),
    Start(Const("To next dialog"), state=SecondSG.main, id="to_next_dialog"),
    state=MySG.first,
)
first_dialog = Dialog(first_window, second_window)

[lubaskinc0de]

should we use ShowMode.AUTO for default or make it Optional?

[Tishka17]

let's do it in the same way as in manager methods:

show_mode: Optional[ShowMode] = None,

[lubaskinc0de]

done

[Tishka17]

let's have full imports from api package like above

[lubaskinc0de]

done