Backup files when autoSaveDelay is > 1500ms

Part of #16509

src/vs/platform/files/common/files.ts

@@ -464,6 +464,8 @@ export const AutoSaveConfiguration = {
 	ON_WINDOW_CHANGE: 'onWindowChange'
 };
 
+export const CONTENT_CHANGE_EVENT_BUFFER_DELAY = 1000;
+
 export interface IFilesConfiguration {
 	files: {
 		associations: { [filepattern: string]: string };

src/vs/workbench/common/editor/untitledEditorModel.ts

@@ -11,7 +11,7 @@ import { StringEditorModel } from 'vs/workbench/common/editor/stringEditorModel'
 import URI from 'vs/base/common/uri';
 import { PLAINTEXT_MODE_ID } from 'vs/editor/common/modes/modesRegistry';
 import { EndOfLinePreference } from 'vs/editor/common/editorCommon';
-import { IFilesConfiguration } from 'vs/platform/files/common/files';
+import { IFilesConfiguration, CONTENT_CHANGE_EVENT_BUFFER_DELAY } from 'vs/platform/files/common/files';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IModeService } from 'vs/editor/common/services/modeService';
 import { IModelService } from 'vs/editor/common/services/modelService';
@@ -23,7 +23,7 @@ import { ITextFileService } from 'vs/workbench/services/textfile/common/textfile
 
 export class UntitledEditorModel extends StringEditorModel implements IEncodingSupport {
 
-	public static DEFAULT_CONTENT_CHANGE_BUFFER_DELAY = 1000;
+	public static DEFAULT_CONTENT_CHANGE_BUFFER_DELAY = CONTENT_CHANGE_EVENT_BUFFER_DELAY;
 
 	private textModelChangeListener: IDisposable;
 	private configurationChangeListener: IDisposable;

src/vs/workbench/parts/backup/common/backupModelTracker.ts

@@ -14,7 +14,9 @@ import { IUntitledEditorService } from 'vs/workbench/services/untitled/common/un
 import { IEnvironmentService } from 'vs/platform/environment/common/environment';
 import { IWorkbenchContribution } from 'vs/workbench/common/contributions';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
-import { IFilesConfiguration, AutoSaveConfiguration } from 'vs/platform/files/common/files';
+import { IFilesConfiguration, AutoSaveConfiguration, CONTENT_CHANGE_EVENT_BUFFER_DELAY } from 'vs/platform/files/common/files';
+
+const AUTO_SAVE_AFTER_DELAY_DISABLED_TIME = CONTENT_CHANGE_EVENT_BUFFER_DELAY + 500;
 
 export class BackupModelTracker implements IWorkbenchContribution {
 
@@ -54,7 +56,13 @@ export class BackupModelTracker implements IWorkbenchContribution {
 	}
 
 	private onConfigurationChange(configuration: IFilesConfiguration): void {
-		this.configuredAutoSaveAfterDelay = configuration && configuration.files && configuration.files.autoSave === AutoSaveConfiguration.AFTER_DELAY;
+		if (!configuration || !configuration.files) {
+			this.configuredAutoSaveAfterDelay = false;
+			return;
+		}
+		this.configuredAutoSaveAfterDelay =
+			(configuration.files.autoSave === AutoSaveConfiguration.AFTER_DELAY &&
+				configuration.files.autoSaveDelay <= AUTO_SAVE_AFTER_DELAY_DISABLED_TIME);
 	}
 
 	private onTextFileModelChanged(event: TextFileModelChangeEvent): void {

src/vs/workbench/services/textfile/common/textFileEditorModel.ts

@@ -23,7 +23,7 @@ import { ITextFileService, IAutoSaveConfiguration, ModelState, ITextFileEditorMo
 import { EncodingMode, EditorModel } from 'vs/workbench/common/editor';
 import { BaseTextEditorModel } from 'vs/workbench/common/editor/textEditorModel';
 import { IBackupFileService, BACKUP_FILE_RESOLVE_OPTIONS } from 'vs/workbench/services/backup/common/backup';
-import { IFileService, IFileStat, IFileOperationResult, FileOperationResult, IContent } from 'vs/platform/files/common/files';
+import { IFileService, IFileStat, IFileOperationResult, FileOperationResult, IContent, CONTENT_CHANGE_EVENT_BUFFER_DELAY } from 'vs/platform/files/common/files';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { IMessageService, Severity } from 'vs/platform/message/common/message';
 import { IModeService } from 'vs/editor/common/services/modeService';
@@ -38,7 +38,7 @@ export class TextFileEditorModel extends BaseTextEditorModel implements ITextFil
 
 	public static ID = 'workbench.editors.files.textFileEditorModel';
 
-	public static DEFAULT_CONTENT_CHANGE_BUFFER_DELAY = 1000;
+	public static DEFAULT_CONTENT_CHANGE_BUFFER_DELAY = CONTENT_CHANGE_EVENT_BUFFER_DELAY;
 
 	private static saveErrorHandler: ISaveErrorHandler;
 	private static saveParticipant: ISaveParticipant;