Impossible to close launch.json in Arduino IDE 2 RC3

[francip]

Describe the bug
Once launch.json is opened through the cog button in the degug view, there is no way to close it. The tab lacks the 'x' button, and any of the shortcuts to close tabs are not working on that tab.
The launch.json tab persist across IDE restart.

To Reproduce
Steps to reproduce the behavior:

1. Open a sketch file
2. Open the Debug view
3. Press the cog button to open launch.json

Expected behavior
'x' button is present and allows closing the tab. Keyboard shortcuts for closing tabs are able to close the tab.

Screenshots
Screenshot showing the launch.json without the 'x' button and keyboard shortcuts tab with the 'x' button next to it.

Desktop (please complete the following information):

• OS: Windows 10 Home
• Version: 2.0.0-rc3 (2021-12-22)

Additional context
Add any other context about the problem here.

[ubidefeo]

considering the Sketch structure, every file in the Sketch's root should not be closable, but any other file in subdirs or otherwise open should.

launch.json is in the .vscode folder, hence it should be closeable