src/vs/workbench/api/common/extHostSCM.ts/ExtHostSCMInputBox/showValidationMessage
class ExtHostSCMInputBox:	showValidationMessage(message: string | vscode.MarkdownString, type: vscode.SourceControlInputBoxValidationType) {
		checkProposedApiEnabled(this._extension, 'scmValidation');

		this.#proxy.$showValidationMessage(this._sourceControlHandle, message, type as any);
	}