src/vs/workbench/contrib/mergeEditor/browser/model/modifiedBaseRange.ts/ModifiedBaseRangeState/getInput
class ModifiedBaseRangeState:	public getInput(inputNumber: 1 | 2): InputState {
		if (this.conflicting) {
			return InputState.conflicting;
		}
		if (inputNumber === 1) {
			return !this.input1 ? InputState.excluded : this.input2First ? InputState.second : InputState.first;
		} else {
			return !this.input2 ? InputState.excluded : !this.input2First ? InputState.second : InputState.first;
		}
	}