Persistent detail view in Graphical Explain.

[gh-tsc]

Describe the bug

The detail view in [Explain] -> [Graphical] from previous "Explain" is shown after a new "Explain" is ran.

To Reproduce

1. Open query tool.
2. Write the query: 'SELECT 22;'
3. Run 'Explain' with the 'Explain' button.
4. Open pane: 'Explain -> Graphical'. Click on 'Result' to open detail of 'Result':
   
5. Remove existing query and write: 'SELECT * FROM (SELECT * FROM UNNEST(ARRAY[22,23])) T;'
6. Run 'Explain' with the 'Explain' button.
7. Open pane: 'Explain -> Graphical'. The Detail view from the first Explain is still showing despite having nothing to do with the new Explain.

Expected behavior

The expected behavior is that no detail view is shown after running a new Explain. The problem is that if you ran similar queries, you can be looking a 'Detail view' you think are from the current query, but is actually from a previous query.

Desktop (please complete the following information):

• OS: ubuntu 22.04
• Version: 8.12
• Mode: server
• Browser (if running in server mode): edge
• Package type: container