src/vs/workbench/browser/parts/activitybar/activitybarPart.ts/ActivitybarPart/getActivitybarItemColors
class ActivitybarPart:	private getActivitybarItemColors(theme: IColorTheme): ICompositeBarColors {
		return {
			activeForegroundColor: theme.getColor(ACTIVITY_BAR_FOREGROUND),
			inactiveForegroundColor: theme.getColor(ACTIVITY_BAR_INACTIVE_FOREGROUND),
			activeBorderColor: theme.getColor(ACTIVITY_BAR_ACTIVE_BORDER),
			activeBackground: theme.getColor(ACTIVITY_BAR_ACTIVE_BACKGROUND),
			badgeBackground: theme.getColor(ACTIVITY_BAR_BADGE_BACKGROUND),
			badgeForeground: theme.getColor(ACTIVITY_BAR_BADGE_FOREGROUND),
			dragAndDropBorder: theme.getColor(ACTIVITY_BAR_DRAG_AND_DROP_BORDER),
			activeBackgroundColor: undefined, inactiveBackgroundColor: undefined, activeBorderBottomColor: undefined,
		};
	}