src/vs/editor/common/viewLayout/viewLineRenderer.ts/CharacterMapping/getDomPosition
class CharacterMapping:	public getDomPosition(column: number): DomPosition {
		const partData = this.charOffsetToPartData(column - 1);
		const partIndex = CharacterMapping.getPartIndex(partData);
		const charIndex = CharacterMapping.getCharIndex(partData);
		return new DomPosition(partIndex, charIndex);
	}