src/vs/workbench/services/themes/common/themeCompatibility.ts/addSettingMapping
function addSettingMapping(settingId: string, colorId: string) {
	let colorIds = settingToColorIdMapping[settingId];
	if (!colorIds) {
		settingToColorIdMapping[settingId] = colorIds = [];
	}
	colorIds.push(colorId);
}