src/vs/workbench/contrib/mergeEditor/browser/model/modifiedBaseRange.ts/ModifiedBaseRangeState/withInput2
class ModifiedBaseRangeState:	public withInput2(value: boolean): ModifiedBaseRangeState {
		return new ModifiedBaseRangeState(
			this.input1,
			value,
			value !== this.input1 ? value : this.input2First,
			false
		);
	}