Testing #105721

• open the JSON settings, add "screencastMode.mouseIndicatorColor": "#ff00ff"
  -> there's no color decorator or color picker as for other colors
• change the value to ff00ff: No error shown

You all get that by adding "format": "color-hex" to the setting configuration. But css color names (red, ...) are not supported by that.
As other color settings don't support the css names either, I suggest to only support hex for consistency reasons.