src/vs/workbench/api/common/extHostSCM.ts/ExtHostSCM/getLastInputBox
class ExtHostSCM:	getLastInputBox(extension: IExtensionDescription): ExtHostSCMInputBox | undefined {
		this.logService.trace('ExtHostSCM#getLastInputBox', extension.identifier.value);

		const sourceControls = this._sourceControlsByExtension.get(ExtensionIdentifier.toKey(extension.identifier));
		const sourceControl = sourceControls && sourceControls[sourceControls.length - 1];
		return sourceControl && sourceControl.inputBox;
	}