Move change theme listener from code file to workspace

[dvandyy]

Description

Currently is onChange event attached to CodeFileView.
If no editor is open & "Automatically change theme based on system appearance" is set, theme is not changing.
Maybe move this to workspace ?

Related Issues

• closes 🐞 Terminal does not switch to dark when the theme is changed from light to dark (or viceversa) #1324
• closes 🐞 Editor does not change color when the theme is changed #1325

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

[Wouter01]

Nice catch!
You're right, this is better moved to the workspace level. Leaving it in the WorkspaceTabGroupView might cause issues with split editors. Could you modify your PR for this?

[dvandyy]

@Wouter01 is this okay ?

[Wouter01]

@Wouter01 is this okay ?

Yes, thank you!

[austincondiff]

Looks great! Good catch!

[austincondiff]

@allcontributors add @dvandyy for bug

[allcontributors]

@austincondiff

I've put up a pull request to add @dvandyy! 🎉