Unexpected theme name showing up in web (microsoft#181091)

* Unexpected theme name showing up in web

* incorperate feedback

Author: aeschli

src/vs/workbench/contrib/themes/browser/themes.contribution.ts

@@ -43,6 +43,7 @@ import { INotificationService, IPromptChoice, Severity } from 'vs/platform/notif
 import { IStorageService, StorageScope, StorageTarget } from 'vs/platform/storage/common/storage';
 import { isWeb } from 'vs/base/common/platform';
 import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
+import { IHostService } from 'vs/workbench/services/host/browser/host';
 
 export const manageExtensionIcon = registerIcon('theme-selection-manage-extension', Codicon.gear, localize('manageExtensionIcon', 'Icon for the \'Manage\' action in the theme selection quick pick.'));
 
@@ -711,27 +712,32 @@ class DefaultThemeUpdatedNotificationContribution implements IWorkbenchContribut
 		@IStorageService private readonly _storageService: IStorageService,
 		@ICommandService private readonly _commandService: ICommandService,
 		@ITelemetryService private readonly _telemetryService: ITelemetryService,
+		@IHostService private readonly _hostService: IHostService,
 	) {
 		if (_storageService.getBoolean(DefaultThemeUpdatedNotificationContribution.STORAGE_KEY, StorageScope.APPLICATION)) {
 			return;
 		}
-		if (this._workbenchThemeService.hasUpdatedDefaultThemes()) {
-			setTimeout(() => {
-				this._showYouGotMigratedNotification();
-			}, 6000);
-		} else {
-			const currentTheme = this._workbenchThemeService.getColorTheme().settingsId;
-			if (currentTheme === ThemeSettingDefaults.COLOR_THEME_LIGHT_OLD || currentTheme === ThemeSettingDefaults.COLOR_THEME_DARK_OLD) {
-				setTimeout(() => {
-					this._tryNewThemeNotification();
-				}, 6000);
+		setTimeout(async () => {
+			if (_storageService.getBoolean(DefaultThemeUpdatedNotificationContribution.STORAGE_KEY, StorageScope.APPLICATION)) {
+				return;
 			}
-		}
+			if (await this._hostService.hadLastFocus()) {
+				this._storageService.store(DefaultThemeUpdatedNotificationContribution.STORAGE_KEY, true, StorageScope.APPLICATION, StorageTarget.USER);
+				if (this._workbenchThemeService.hasUpdatedDefaultThemes()) {
+					this._showYouGotMigratedNotification();
+				} else {
+					const currentTheme = this._workbenchThemeService.getColorTheme().settingsId;
+					if (currentTheme === ThemeSettingDefaults.COLOR_THEME_LIGHT_OLD || currentTheme === ThemeSettingDefaults.COLOR_THEME_DARK_OLD) {
+						this._tryNewThemeNotification();
+					}
+				}
+			}
+		}, 6000);
 	}
 
 	private async _showYouGotMigratedNotification(): Promise<void> {
-		this._storageService.store(DefaultThemeUpdatedNotificationContribution.STORAGE_KEY, true, StorageScope.APPLICATION, StorageTarget.USER);
-		const newThemeSettingsId = isWeb ? ThemeSettingDefaults.COLOR_THEME_LIGHT : ThemeSettingDefaults.COLOR_THEME_DARK;
+		const usingLight = this._workbenchThemeService.getColorTheme().type === ColorScheme.LIGHT;
+		const newThemeSettingsId = usingLight ? ThemeSettingDefaults.COLOR_THEME_LIGHT : ThemeSettingDefaults.COLOR_THEME_DARK;
 		const newTheme = (await this._workbenchThemeService.getColorThemes()).find(theme => theme.settingsId === newThemeSettingsId);
 		if (newTheme) {
 			const choices = [
@@ -752,7 +758,7 @@ class DefaultThemeUpdatedNotificationContribution implements IWorkbenchContribut
 					label: localize('button.revert', "Revert"),
 					run: async () => {
 						this._writeTelemetry('keepOld');
-						const oldSettingsId = isWeb ? ThemeSettingDefaults.COLOR_THEME_LIGHT_OLD : ThemeSettingDefaults.COLOR_THEME_DARK_OLD;
+						const oldSettingsId = usingLight ? ThemeSettingDefaults.COLOR_THEME_LIGHT_OLD : ThemeSettingDefaults.COLOR_THEME_DARK_OLD;
 						const oldTheme = (await this._workbenchThemeService.getColorThemes()).find(theme => theme.settingsId === oldSettingsId);
 						if (oldTheme) {
 							this._workbenchThemeService.setColorTheme(oldTheme, 'auto');
@@ -772,7 +778,6 @@ class DefaultThemeUpdatedNotificationContribution implements IWorkbenchContribut
 	}
 
 	private async _tryNewThemeNotification(): Promise<void> {
-		this._storageService.store(DefaultThemeUpdatedNotificationContribution.STORAGE_KEY, true, StorageScope.APPLICATION, StorageTarget.USER);
 		const newThemeSettingsId = this._workbenchThemeService.getColorTheme().type === ColorScheme.LIGHT ? ThemeSettingDefaults.COLOR_THEME_LIGHT : ThemeSettingDefaults.COLOR_THEME_DARK;
 		const theme = (await this._workbenchThemeService.getColorThemes()).find(theme => theme.settingsId === newThemeSettingsId);
 		if (theme) {