Subscription being reloaded unnecessarily

[kinow]

Describe the bug

Found this while testing a PR with @hjoliver #749 (comment)

Copied the initialQuery and finalQuery, and realized it's a bug caused by #726

The diff shows that some values were incorrectly merged.

Release version(s) and/or repository branch(es) affected?

master

Steps to reproduce the bug

1. Add a Tree view
2. Add a second Tree view
3. Either observe in Network tab or see if the components are cleared, leaving a blank view, then reloaded

Expected behavior

Since both views use the same query, nothing must change in the UI, except for a new view added.

Screenshots

Additional context

kinow@ranma:/tmp$ diff initial final
2c2
<   deltas(workflows: [$workflowId], stripNull: true) {
---
>   deltas(workflows: [$workflowId, $workflowId], stripNull: true) {
24c24
<   cyclePoints: familyProxies(ids: ["root"], ghosts: true) {
---
>   cyclePoints: familyProxies(ids: ["root", "root"], ghosts: true) {
27c27
<   familyProxies(exids: ["root"], sort: {keys: ["name"]}, ghosts: true) {
---
>   familyProxies(exids: ["root", "root"], sort: {keys: ["name"]}, ghosts: true) {
45c45
<   familyProxies(exids: ["root"], ghosts: true) {
---
>   familyProxies(exids: ["root", "root"], ghosts: true) {
65c65
<     states: ["failed", "preparing", "submit-failed", "submitted", "running"]
---
>     states: ["failed", "preparing", "submit-failed", "submitted", "running", "failed", "preparing", "submit-failed", "submitted", "running"]

Pull requests welcome!
This is an Open Source project - please consider contributing a bug fix
yourself (please read CONTRIBUTING.md before starting any work though).