SceneAppPage: preserving tabs

[xforman2]

So after discovering #559, I thought it would be nice to have a option to preserve the tabs.
I came up with an idea.

Now the SceneAppPageRenderer always renders the first tab with two urls: the parent page url and the actual tab url.
But if we can remember the last selected tab, we can match the parent page url to any tab. This is what _lastTabIndex is for.
And you also have an option to choose not preserving tabs with preserveTab property.

Let me know what you think.

[torkelo]

Not sure this makes sense, tabs have urls. so if you want to change the default route/tab for page you will need to do that through some redirect.

[xforman2]

I do not want to change the default route, I just try to change what will be rendered. So I just reused the old logic:

• The 1st tab in the array of tabs is being rendered with the default url (parent page).

And now:

• The parent SceneAppPage remembers the last active tab and in SceneAppPageRenderer adds the last active tab to render with a default route (parent page url).

Hope that makes it more clear.

[torkelo]

that seems a bit wrong that different pages are rendered for the same url

[xforman2]

I agree that it is not good to have different pages render with the same url, so I tried what you suggested in the first answer. What do you think?

[xforman2]

@torkelo I am not sure if you looked at my other implementation but it would be really helpful if this could get resolved

[torkelo]

I have, the solution looks a bit complex / messy. Should be a simpler way to do this