Re-instate swipeToNavigate for Mac (fix #204812)

src/vs/platform/windows/electron-main/windowImpl.ts

@@ -1042,6 +1042,16 @@ export class CodeWindow extends BaseWindow implements ICodeWindow {
 
 	private onConfigurationUpdated(e?: IConfigurationChangeEvent): void {
 
+		// Swipe command support (macOS)
+		if (isMacintosh && (!e || e.affectsConfiguration('workbench.editor.swipeToNavigate'))) {
+			const swipeToNavigate = this.configurationService.getValue<boolean>('workbench.editor.swipeToNavigate');
+			if (swipeToNavigate) {
+				this.registerSwipeListener();
+			} else {
+				this.swipeListenerDisposable.clear();
+			}
+		}
+
 		// Menubar
 		if (!e || e.affectsConfiguration(MenuSettings.MenuBarVisibility)) {
 			const newMenuBarVisibility = this.getMenuBarVisibility();
@@ -1085,6 +1095,22 @@ export class CodeWindow extends BaseWindow implements ICodeWindow {
 		}
 	}
 
+	private readonly swipeListenerDisposable = this._register(new MutableDisposable());
+
+	private registerSwipeListener(): void {
+		this.swipeListenerDisposable.value = Event.fromNodeEventEmitter<string>(this._win, 'swipe', (event: Electron.Event, cmd: string) => cmd)(cmd => {
+			if (!this.isReady) {
+				return; // window must be ready
+			}
+
+			if (cmd === 'left') {
+				this.send('vscode:runAction', { id: 'workbench.action.openPreviousRecentlyUsedEditor', from: 'mouse' });
+			} else if (cmd === 'right') {
+				this.send('vscode:runAction', { id: 'workbench.action.openNextRecentlyUsedEditor', from: 'mouse' });
+			}
+		});
+	}
+
 	addTabbedWindow(window: ICodeWindow): void {
 		if (isMacintosh && window.win) {
 			this._win.addTabbedWindow(window.win);

src/vs/workbench/browser/parts/editor/editor.ts

@@ -64,6 +64,7 @@ export const DEFAULT_EDITOR_PART_OPTIONS: IEditorPartOptions = {
 	scrollToSwitchTabs: false,
 	enablePreviewFromCodeNavigation: false,
 	closeOnFileDelete: false,
+	swipeToNavigate: false,
 	mouseBackForwardToNavigate: true,
 	restoreViewState: true,
 	splitInGroupLayout: 'horizontal',
@@ -137,6 +138,7 @@ function validateEditorPartOptions(options: IEditorPartOptions): IEditorPartOpti
 		'closeOnFileDelete': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['closeOnFileDelete']),
 		'closeEmptyGroups': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['closeEmptyGroups']),
 		'revealIfOpen': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['revealIfOpen']),
+		'swipeToNavigate': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['swipeToNavigate']),
 		'mouseBackForwardToNavigate': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['mouseBackForwardToNavigate']),
 		'restoreViewState': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['restoreViewState']),
 		'splitOnDragAndDrop': new BooleanVerifier(DEFAULT_EDITOR_PART_OPTIONS['splitOnDragAndDrop']),

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

@@ -348,6 +348,12 @@ const registry = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Con
 				'description': localize('revealIfOpen', "Controls whether an editor is revealed in any of the visible groups if opened. If disabled, an editor will prefer to open in the currently active editor group. If enabled, an already opened editor will be revealed instead of opened again in the currently active editor group. Note that there are some cases where this setting is ignored, such as when forcing an editor to open in a specific group or to the side of the currently active group."),
 				'default': false
 			},
+			'workbench.editor.swipeToNavigate': {
+				'type': 'boolean',
+				'description': localize('swipeToNavigate', "Navigate between open files using three-finger swipe horizontally. Note that System Preferences > Trackpad > More Gestures must be set to 'Swipe with two or three fingers'."),
+				'default': false,
+				'included': isMacintosh && !isWeb
+			},
 			'workbench.editor.mouseBackForwardToNavigate': {
 				'type': 'boolean',
 				'description': localize('mouseBackForwardToNavigate', "Enables the use of mouse buttons four and five for commands 'Go Back' and 'Go Forward'."),

src/vs/workbench/common/editor.ts

@@ -1254,6 +1254,7 @@ interface IEditorPartConfiguration {
 	closeEmptyGroups?: boolean;
 	autoLockGroups?: Set<string>;
 	revealIfOpen?: boolean;
+	swipeToNavigate?: boolean;
 	mouseBackForwardToNavigate?: boolean;
 	labelFormat?: 'default' | 'short' | 'medium' | 'long';
 	restoreViewState?: boolean;