src/vs/editor/contrib/wordHighlighter/browser/wordHighlighter.ts/WordHighlighter/moveBack
class WordHighlighter:	public moveBack() {
		let highlights = this._getSortedHighlights();
		let index = highlights.findIndex((range) => range.containsPosition(this.editor.getPosition()));
		let newIndex = ((index - 1 + highlights.length) % highlights.length);
		let dest = highlights[newIndex];
		try {
			this._ignorePositionChangeEvent = true;
			this.editor.setPosition(dest.getStartPosition());
			this.editor.revealRangeInCenterIfOutsideViewport(dest);
			const word = this._getWord();
			if (word) {
				const lineContent = this.editor.getModel().getLineContent(dest.startLineNumber);
				alert(`${lineContent}, ${newIndex + 1} of ${highlights.length} for '${word.word}'`);
			}
		} finally {
			this._ignorePositionChangeEvent = false;
		}
	}