workbench.colorCustomization.editor.background does not respect transparency

[rowanG077]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.60.2
• OS Version: NixOS unstable

Steps to Reproduce:

1. Add workbench.colorCustomization.editor.background to the settings.json and set it to some color which has transparency. For example #ff000059.
2. The editor does NOT show any transparency.

Expected behaviour:
The editor pane should be transparent according the workbench.colorCustomization.editor.background setting. This probably extends to most color options.

[rowanG077]

In fact there used to be a pr for this: #52707

But it got closed for no apparent reason.

[alexdima]

I think this is about having the window be transparent. (i.e. seeing the desktop background through the vscode window and through the code editor).

[rowanG077]

@alexdima Yes this is what I expected to happen if I added transparency to the background. For example my terminal can set a background color with transparency which means the content is still solid while the background in the terminal is transparent and any windows/background below the terminal are visible.

[bpasero]

/duplicate #32257