Vuex panel does not persist expanded / collapsed data when toggling other panels

[jq-87]

Version

4.1.5

Browser and OS info

Chrome 70, OSX 10.13.6

Steps to reproduce

1. Open vue-devtools on a project using vuex.
2. Go to vuex panel and expand some data
3. Go to vue components panel
4. Go back to vuex panel - you will notice the data that you expanded is now collapsed again.

What is expected?

If users expand data in vuex panel - that data should stay expanded.

What is actually happening?

Expanded data in vuex panel auto collapses/resets when navigating away and back to vuex panel

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this is frustrating if you regularly toggle panels in vue-devtools