_render(visibleStartLineNumber, visibleEndLineNumber, decorations) {
        const output = [];
        for (let lineNumber = visibleStartLineNumber; lineNumber <= visibleEndLineNumber; lineNumber++) {
            const lineIndex = lineNumber - visibleStartLineNumber;
            output[lineIndex] = new VisibleLineDecorationsToRender();
        }
        if (decorations.length === 0) {
            return output;
        }
        // Sort decorations by className, then by startLineNumber and then by endLineNumber
        decorations.sort((a, b) => {
            if (a.className === b.className) {
                if (a.startLineNumber === b.startLineNumber) {
                    return a.endLineNumber - b.endLineNumber;
                }
                return a.startLineNumber - b.startLineNumber;
            }
            return (a.className < b.className ? -1 : 1);
        });
        let prevClassName = null;
        let prevEndLineIndex = 0;
        for (let i = 0, len = decorations.length; i < len; i++) {
            const d = decorations[i];
            const className = d.className;
            const zIndex = d.zIndex;
            let startLineIndex = Math.max(d.startLineNumber, visibleStartLineNumber) - visibleStartLineNumber;
            const endLineIndex = Math.min(d.endLineNumber, visibleEndLineNumber) - visibleStartLineNumber;
            if (prevClassName === className) {
                // Here we avoid rendering the same className multiple times on the same line
                startLineIndex = Math.max(prevEndLineIndex + 1, startLineIndex);
                prevEndLineIndex = Math.max(prevEndLineIndex, endLineIndex);
            }
            else {
                prevClassName = className;
                prevEndLineIndex = endLineIndex;
            }
            for (let i = startLineIndex; i <= prevEndLineIndex; i++) {
                output[i].add(new LineDecorationToRender(className, zIndex, d.tooltip));
            }
        }
        return output;
    }
Returns an array with an element for each visible line number.