Provide access to theme colours from extensions

[Gruntfuggly]

It would be great if there was a mechanism to get the current themed colours by an extension.

e.g. something along the lines of:
vscode.window.getThemeColor( id: string )

and then having a method of ThemeColor that returns the rgb(a). That way extensions could match colours to themes.

At the moment I have to use a configuration setting...

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Changing font colour of the file tree (#46797)
• [themes] Add editor.findMatchForeground (#29091)
• Be able to colour tabs in a multi-root project (#43292)

[usernamehw]

There is one method (only it just returns reference and not rgb):

new vscode.ThemeColor('activityBar.background')

[Gruntfuggly]

Yeh, that gets you half way, but you can only use it as input into other API calls...

[aeschli]

duplicate of #32813