src/vs/editor/contrib/suggest/suggestWidget.ts/SuggestWidget/_onThemeChange
class SuggestWidget:	private _onThemeChange(theme: IColorTheme) {
		const backgroundColor = theme.getColor(editorSuggestWidgetBackground);
		if (backgroundColor) {
			this.element.domNode.style.backgroundColor = backgroundColor.toString();
			this._messageElement.style.backgroundColor = backgroundColor.toString();
			this._details.widget.domNode.style.backgroundColor = backgroundColor.toString();
		}
		const borderColor = theme.getColor(editorSuggestWidgetBorder);
		if (borderColor) {
			this.element.domNode.style.borderColor = borderColor.toString();
			this._messageElement.style.borderColor = borderColor.toString();
			this._status.element.style.borderTopColor = borderColor.toString();
			this._details.widget.domNode.style.borderColor = borderColor.toString();
			this._detailsBorderColor = borderColor.toString();
		}
		const focusBorderColor = theme.getColor(focusBorder);
		if (focusBorderColor) {
			this._detailsFocusBorderColor = focusBorderColor.toString();
		}
		this._details.widget.borderWidth = theme.type === 'hc' ? 2 : 1;
	}