make dialog can be stack popup

[Coloryr]

[SKProCH]

I appreciate this work, the reason I haven't done it myself is because I don't know how it should be designed as a feature.

I need to spend a little more time thinking about this implementation.

[SKProCH]

Overall works fine, but i think there is need for proper handling of disabling of multiple dialogs. E.g. if i open 2 dialogs, i should be able to interact only with a top one (second one should be non interactable).
Close command also always closes the top dialog (but if other dialogs will be non interactable, then this is not a problem).

And probably we should move multidialog logic to separate control (since currently at least IsOpen would works weirdly), what do you think? Btw, after looking at this PR i kinda want to rewrite dialoghost almost from scratch, but i think what i don't have enough time

[SKProCH]

Probably it should be moved into host itself. We actually doesn't want to control it from the host side

[Coloryr]

Yes, that is better

[SKProCH]

CurrentSession should be IReadOnlyList.
Also, you dont actually change anything about making non top dialogs non interactable.

E.g. if i open 2 dialogs, i should be able to interact only with a top one (second one should be non interactable).
Close command also always closes the top dialog (but if other dialogs will be non interactable, then this is not a problem).

Is it done intentionally, or you address this in a future, or i should do it myself?

[Coloryr]

CurrentSession should be IReadOnlyList. Also, you dont actually change anything about making non top dialogs non interactable.

E.g. if i open 2 dialogs, i should be able to interact only with a top one (second one should be non interactable).
Close command also always closes the top dialog (but if other dialogs will be non interactable, then this is not a problem).

Is it done intentionally, or you address this in a future, or i should do it myself?

CurrentSession would be better with the separate property, because CloseCommand only closes the current view, and turn next top view.
DisposeList It is used to unbind some bindings. When a top view closed, its should be canceled binding itself, or it can be move to pop view
I think it's better for you to complete it than for me