fix microsoft#152240 (microsoft#152431)

Author: bpasero

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

@@ -349,7 +349,7 @@ MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: TOGGLE_DIFF_SID
 MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: SHOW_EDITORS_IN_GROUP, title: localize('showOpenedEditors', "Show Opened Editors") }, group: '3_open', order: 10 });
 MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: CLOSE_EDITORS_IN_GROUP_COMMAND_ID, title: localize('closeAll', "Close All") }, group: '5_close', order: 10 });
 MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: CLOSE_SAVED_EDITORS_COMMAND_ID, title: localize('closeAllSaved', "Close Saved") }, group: '5_close', order: 20 });
-MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: TOGGLE_KEEP_EDITORS_COMMAND_ID, title: localize('togglePreviewMode', "Disable Preview Mode"), toggled: ContextKeyExpr.not('config.workbench.editor.enablePreview') }, group: '7_settings', order: 10 });
+MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: TOGGLE_KEEP_EDITORS_COMMAND_ID, title: localize('togglePreviewMode', "Enable Preview Editors"), toggled: ContextKeyExpr.has('config.workbench.editor.enablePreview') }, group: '7_settings', order: 10 });
 MenuRegistry.appendMenuItem(MenuId.EditorTitle, { command: { id: TOGGLE_LOCK_GROUP_COMMAND_ID, title: localize('lockGroup', "Lock Group"), toggled: ActiveEditorGroupLockedContext }, group: '8_lock', order: 10, when: MultipleEditorGroupsContext });
 
 interface IEditorToolItem { id: string; title: string; icon?: { dark?: URI; light?: URI } | ThemeIcon }