Add possibility to use `Page.show_...()` methods without argument

[bleudev]

Please Describe The Problem To Be Solved

f. e. i want to show drawer, but i don't want to define argument in Page.show_drawer() method. Then i must use this code:

page.drawer = ...
page.show_drawer(page.drawer)

I want to use this code:

page.drawer = ...
page.show_drawer()

(Optional): Suggest A Solution

    @overload
    def show_drawer(self) -> None: ...
    @overload
    def show_drawer(self, drawer: NavigationDrawer) -> None: ...
    def show_drawer(self, drawer = None) -> None:
        if drawer:
            self.drawer = drawer
        self.drawer.open = True
        self.update()

[FeodorFitsner]

Would you care for PR? ;)

[bleudev]

Would you care for PR? ;)

Already. I have opened this issue for it

[FeodorFitsner]

What PR is that?

[bleudev]

What PR is that?

3172