Setup function called multiple times with router-view and keep-alive

[mibiio]

Reproduction

https://stackblitz.com/edit/quasarframework-2jj1tx?file=src%2Frouter%2Froutes.js

Steps to reproduce the bug

1. Click appOne
2. Click appChildOne -> setup function called 2 times for appChildOne
3. Click appTwo
4. Click appChildOne -> setup function called 3 times for appChildOne
5. From this point on, all setup functions in all childs are called 3 times

Expected behavior

The setup function should be called exactly one time for each component.

Actual behavior

What happened?

When using keep-alive with router-views the setup function is called multiple times.
Following structure:

-MainLayout
 -AppPage
  -AppOnePage
    -ChildOne
    -ChildTwo
    -ChildThree
  -AppTwoPage
    -ChildOne
    -ChildTwo
    -ChildThree
  -AppThreePage
    -ChildOne
    -ChildTwo
    -ChildThree

The problem is that the setup function of all Child pages is called more often than once.

Additional information

No response

[posva]

Duplicate of #626

[posva]

Please, search existing issues and pull requests before opening issues, it saves maintainers a lot of time 🙏