Time scale mark items overlap each other

[kirchet]

Lightweight Charts™ Version: 4.1.1 -->

Steps/code to reproduce:

const chartElement = document.createElement('div');
document.body.appendChild(chartElement);

const formatter = new Intl.DateTimeFormat('ja-JP-u-hc-h23', {
	month: 'short',
	day: 'numeric',
	calendar: 'gregory',
	year: 'numeric',
});

class HorzScale {
	setOptions() {
	}

	preprocessData() {
	}

	convertHorzItemToInternal(item) {
		return item;
	}

	createConverterToInternalObj() {
		return (item) => this.convertHorzItemToInternal(item);
	}

	key(internalItem) {
		return internalItem;
	}

	cacheKey(internalItem) {
		return internalItem;
	}

	updateFormatter(options) {
	}

	formatHorzItem(item) {
		return formatter.format(new Date(item).getTime());
	}

	formatTickmark(item) {
		return formatter.format(new Date(item.time).getTime());
	}

	maxTickMarkWeight(marks) {
		return marks.reduce((a, b) => a.weight > b.weight ? a : b, marks[0]).weight;
	}

	fillWeightsForPoints(sortedTimePoints, startIndex) {
		for (let i = startIndex; i < sortedTimePoints.length; i += 1) {
			const item = sortedTimePoints[i];
      item.timeWeight = 1;
		}
	}
}

const chart = LightweightCharts.createChartEx(
	chartElement,
  new HorzScale(),
  {
  	width: chartElement.clientWidth,
    height: 300,
    timeScale: {
    	tickMarkMaxCharacterLength: 12,
      fixLeftEdge: true,
      fixRightEdge: true,
    }
  }
);
addEventListener('resize', () => {
	chart.applyOptions({ width: chartElement.clientWidth });
  chart.timeScale().fitContent();
});
var areaSeries = chart.addAreaSeries();
areaSeries.setData([
	{ time: '2018-10-19', value: 35.98 },
	{ time: '2018-10-22', value: 35.75 },
	{ time: '2018-10-23', value: 35.65 },
	{ time: '2018-10-24', value: 34.12 },
	{ time: '2018-10-25', value: 35.84 },
	{ time: '2018-10-26', value: 35.24 },
	{ time: '2018-10-29', value: 35.99 },
	{ time: '2018-10-30', value: 37.71 },
	{ time: '2018-10-31', value: 38.14 },
	{ time: '2018-11-01', value: 37.95 },
	{ time: '2018-11-02', value: 37.66 },
	{ time: '2018-11-05', value: 38.02 },
	{ time: '2018-11-06', value: 37.73 },
	{ time: '2018-11-07', value: 38.30 },
	{ time: '2018-11-08', value: 38.30 },
	{ time: '2018-11-09', value: 38.34 },
	{ time: '2018-11-12', value: 38.00 },
	{ time: '2018-11-13', value: 37.72 },
	{ time: '2018-11-14', value: 38.29 },
	{ time: '2018-11-15', value: 38.49 },
	{ time: '2018-11-16', value: 38.59 },
	{ time: '2018-11-19', value: 38.18 },
	{ time: '2018-11-20', value: 36.76 },
	{ time: '2018-11-21', value: 37.51 },
	{ time: '2018-11-23', value: 37.39 },
	{ time: '2018-11-26', value: 37.77 },
	{ time: '2018-11-27', value: 38.36 },
	{ time: '2018-11-28', value: 39.06 },
	{ time: '2018-11-29', value: 39.42 },
	{ time: '2018-11-30', value: 39.01 },
	{ time: '2018-12-03', value: 39.15 },
	{ time: '2018-12-04', value: 37.69 },
	{ time: '2018-12-06', value: 37.88 },
	{ time: '2018-12-07', value: 37.41 },
	{ time: '2018-12-10', value: 37.35 },
	{ time: '2018-12-11', value: 36.84 },
	{ time: '2018-12-12', value: 36.98 },
	{ time: '2018-12-13', value: 36.76 },
	{ time: '2018-12-14', value: 36.34 },
	{ time: '2018-12-17', value: 36.21 },
	{ time: '2018-12-18', value: 35.65 },
	{ time: '2018-12-19', value: 35.19 },
	{ time: '2018-12-20', value: 34.62 },
	{ time: '2018-12-21', value: 33.75 },
	{ time: '2018-12-24', value: 33.07 },
	{ time: '2018-12-26', value: 34.14 },
	{ time: '2018-12-27', value: 34.47 },
	{ time: '2018-12-28', value: 34.35 },
	{ time: '2018-12-31', value: 34.05 },
	{ time: '2019-01-02', value: 34.37 },
	{ time: '2019-01-03', value: 34.64 },
	{ time: '2019-01-04', value: 35.81 },
	{ time: '2019-01-07', value: 35.43 },
	{ time: '2019-01-08', value: 35.72 },
	{ time: '2019-01-09', value: 36.06 },
	{ time: '2019-01-10', value: 35.82 },
	{ time: '2019-01-11', value: 35.63 },
	{ time: '2019-01-14', value: 35.77 },
	{ time: '2019-01-15', value: 35.83 },
	{ time: '2019-01-16', value: 35.90 },
	{ time: '2019-01-17', value: 35.91 },
	{ time: '2019-01-18', value: 36.21 },
	{ time: '2019-01-22', value: 34.97 },
	{ time: '2019-01-23', value: 36.89 },
	{ time: '2019-01-24', value: 36.24 },
	{ time: '2019-01-25', value: 35.78 },
	{ time: '2019-01-28', value: 35.37 },
	{ time: '2019-01-29', value: 36.08 },
	{ time: '2019-01-30', value: 35.43 },
	{ time: '2019-01-31', value: 36.57 },
	{ time: '2019-02-01', value: 36.79 },
	{ time: '2019-02-04', value: 36.77 },
	{ time: '2019-02-05', value: 37.15 },
	{ time: '2019-02-06', value: 37.17 },
	{ time: '2019-02-07', value: 37.68 },
	{ time: '2019-02-08', value: 37.60 },
	{ time: '2019-02-11', value: 37.00 },
	{ time: '2019-02-12', value: 37.24 },
	{ time: '2019-02-13', value: 37.03 },
	{ time: '2019-02-14', value: 37.26 },
	{ time: '2019-02-15', value: 37.77 },
	{ time: '2019-02-19', value: 37.55 },
	{ time: '2019-02-20', value: 37.79 },
	{ time: '2019-02-21', value: 38.47 },
	{ time: '2019-02-22', value: 38.61 },
	{ time: '2019-02-25', value: 38.57 },
	{ time: '2019-02-26', value: 38.80 },
	{ time: '2019-02-27', value: 38.53 },
	{ time: '2019-02-28', value: 38.67 },
	{ time: '2019-03-01', value: 39.10 },
	{ time: '2019-03-04', value: 38.73 },
	{ time: '2019-03-05', value: 38.72 },
	{ time: '2019-03-06', value: 38.61 },
	{ time: '2019-03-07', value: 38.38 },
	{ time: '2019-03-08', value: 38.19 },
	{ time: '2019-03-11', value: 39.17 },
	{ time: '2019-03-12', value: 39.49 },
	{ time: '2019-03-13', value: 39.56 },
	{ time: '2019-03-14', value: 39.87 },
	{ time: '2019-03-15', value: 40.47 },
	{ time: '2019-03-18', value: 39.92 },
	{ time: '2019-03-19', value: 39.78 },
	{ time: '2019-03-20', value: 39.47 },
	{ time: '2019-03-21', value: 40.05 },
	{ time: '2019-03-22', value: 39.46 },
	{ time: '2019-03-25', value: 39.18 },
	{ time: '2019-03-26', value: 39.63 },
	{ time: '2019-03-27', value: 40.21 },
	{ time: '2019-03-28', value: 40.42 },
	{ time: '2019-03-29', value: 39.98 },
	{ time: '2019-04-01', value: 40.31 },
	{ time: '2019-04-02', value: 40.02 },
	{ time: '2019-04-03', value: 40.27 },
	{ time: '2019-04-04', value: 40.41 },
	{ time: '2019-04-05', value: 40.42 },
	{ time: '2019-04-08', value: 40.71 },
	{ time: '2019-04-09', value: 41.04 },
	{ time: '2019-04-10', value: 41.08 },
	{ time: '2019-04-11', value: 41.04 },
	{ time: '2019-04-12', value: 41.30 },
	{ time: '2019-04-15', value: 41.78 },
	{ time: '2019-04-16', value: 41.97 },
	{ time: '2019-04-17', value: 42.57 },
	{ time: '2019-04-18', value: 42.43 },
	{ time: '2019-04-22', value: 42.00 },
	{ time: '2019-04-23', value: 41.99 },
	{ time: '2019-04-24', value: 41.85 },
	{ time: '2019-04-25', value: 42.93 },
	{ time: '2019-04-26', value: 43.08 },
	{ time: '2019-04-29', value: 43.45 },
	{ time: '2019-04-30', value: 43.53 },
	{ time: '2019-05-01', value: 43.42 },
	{ time: '2019-05-02', value: 42.65 },
	{ time: '2019-05-03', value: 43.29 },
	{ time: '2019-05-06', value: 43.30 },
	{ time: '2019-05-07', value: 42.76 },
	{ time: '2019-05-08', value: 42.55 },
	{ time: '2019-05-09', value: 42.92 },
	{ time: '2019-05-10', value: 43.15 },
	{ time: '2019-05-13', value: 42.28 },
	{ time: '2019-05-14', value: 42.91 },
	{ time: '2019-05-15', value: 42.49 },
	{ time: '2019-05-16', value: 43.19 },
	{ time: '2019-05-17', value: 43.54 },
	{ time: '2019-05-20', value: 42.78 },
	{ time: '2019-05-21', value: 43.29 },
	{ time: '2019-05-22', value: 43.30 },
	{ time: '2019-05-23', value: 42.73 },
	{ time: '2019-05-24', value: 42.67 },
	{ time: '2019-05-28', value: 42.75 },
]);

chart.timeScale().fitContent();

Actual behavior:

Time scale marks text items overlap each other.

Expected behavior:

Time scale marks text items do not overlap each other.

Screenshots:

CodeSandbox/JSFiddle/etc link:

https://jsfiddle.net/kirchet/5wdtznog/