src/vs/editor/common/viewLayout/viewLineRenderer.ts/CharacterMapping/getAbsoluteOffset
class CharacterMapping:	public getAbsoluteOffset(column: number): number {
		if (this._absoluteOffsets.length === 0) {
			// No characters on this line
			return 0;
		}
		return this._absoluteOffsets[column - 1];
	}