createTextEditorDecorationType doesn't display text in single quotes

[capaj]

Version 1.8.1
Commit ee428b0
Date 2016-12-19T14:41:20.664Z
Shell 1.4.6
Renderer 53.0.2785.143
Node 6.5.0

• OS Version: Ubuntu 16.10

When I add a decoration like this:

                  const decoration = vscode.window.createTextEditorDecorationType({
                    isWholeLine: true,
                    backgroundColor: `rgba(255,0,0, 0.5)`,
                    color: 'white',
                    after: {
                      contentText: `'this is not visible'`,
                      color: 'rgba(1, 1, 1, 1.0)'
                    }
                  })
                  const range = new Range(line, 0, line, 1000)
                  window.activeTextEditor.setDecorations(decoration, [range])

the textContent 'this is not visible' is not visible.

Also when I put in just ' it displays some css.

[aeschli]

fixed by #18361