- [core] added support for Node.js `12.x` [#7968](https://github.com/eclipse-theia/theia/pull/7968)
- From now on, you can use Node.js `12.x` to build Theia from sources. The recommended minimum version is aligned with `electron` (Node.js `12.14.1`).
- Support for Node.js `10.x` will be dropped in one of the forthcoming releases.
- [core] fixed handling of environment variables on Windows [#7973](https://github.com/eclipse-theia/theia/pull/7973)
- [core] fixed issue when selecting a tree node after performing a manual scroll [#8154](https://github.com/eclipse-theia/theia/pull/8154)
- [debug] added a `select and run` debug statusbar item [#8134](https://github.com/eclipse-theia/theia/pull/8134)
- [debug] added handling to perform `save` when starting a debug session [#8115](https://github.com/eclipse-theia/theia/pull/8115)
- [debug] addressed an issue not awaiting the result of the debug handler [#8117](https://github.com/eclipse-theia/theia/pull/8117)
- [editor] added handling to perform a `save all` when turning `auto-save` on [#8163](https://github.com/eclipse-theia/theia/pull/8163)
- [editor] improved extensibility of menu and keybinding contributions [#8188](https://github.com/eclipse-theia/theia/pull/8188)
- [git] fixed the opening of deleted files [#8107](https://github.com/eclipse-theia/theia/pull/8107)
- [markers] added `problems.autoReveal` preference to control sync between editors and the problem-view [#8172](https://github.com/eclipse-theia/theia/pull/8172)
- [monaco] improved extensibility of menu and keybinding contributions [#8188](https://github.com/eclipse-theia/theia/pull/8188)
- [monaco] normalized base pattern path to support different operating systems [#8268](https://github.com/eclipse-theia/theia/pull/8268)
- [monaco] removed unused dependencies [#8109](https://github.com/eclipse-theia/theia/pull/8109)
- [navigator] added `copy relative path` to the explorer context-menu and command palette [#8092](https://github.com/eclipse-theia/theia/pull/8092)
- [output] added `copy all` context-menu item for the output-view [#8057](https://github.com/eclipse-theia/theia/pull/8057)
- [plugin] added command `copyRelativeFilePath` [#8092](https://github.com/eclipse-theia/theia/pull/8092)
- [plugin] added support for `resolveDebugConfigurationWithSubstitutedVariables` API [#8253](https://github.com/eclipse-theia/theia/pull/8253)
- [plugin] added support for `vscode.workspace.findTextInFiles` API [#7868](https://github.com/eclipse-theia/theia/pull/7868)
- [plugin] added support for theme icons [#8267](https://github.com/eclipse-theia/theia/pull/8267)
- [plugin] fixed focused handling of webviews when dismissing the quick-open widget [#8137](https://github.com/eclipse-theia/theia/pull/8137)
- [plugin] fixed the display of file-icons with a dot in the name [#7680](https://github.com/eclipse-theia/theia/pull/7680)
- [plugin] fixed the modal dialog max size and text-wrapping [#8080](https://github.com/eclipse-theia/theia/pull/8080)
- [plugin] improved handling of the plugin host activation exceptions [#8103](https://github.com/eclipse-theia/theia/pull/8103)
- [plugin] removed unnecessary slash at the end of the `pluginPath` [#8045](https://github.com/eclipse-theia/theia/pull/8045)
- [plugin] updated logic to allow `Command` type in statusbar items [#8253](https://github.com/eclipse-theia/theia/pull/8253)
- [plugin] updated logic to allow `vsix` without publishers to be loaded [#8196](https://github.com/eclipse-theia/theia/pull/8196)
- [repo] removed unused resolution for `vscode-json-languageserver` [#8132](https://github.com/eclipse-theia/theia/pull/8132)
- [search-in-workspace] improved search behavior to only trigger search on input change or <kbd>ENTER</kbd> [#8229](https://github.com/eclipse-theia/theia/pull/8229)
- [task] fixed an issue where `onDidEndTaskProcess` was not fired for plugins when task ended [#8141](https://github.com/eclipse-theia/theia/pull/8141)
- [task] introduced a token to scope contributed tasks [#7996](https://github.com/eclipse-theia/theia/pull/7996)
- [terminal] fixed xterm issue causing an extraneous 'cursor-like' overlay element [#8204](https://github.com/eclipse-theia/theia/pull/8204)
- [test] improved api-tests by increasing timeout so plugin views can be properly prepared [#8151](https://github.com/eclipse-theia/theia/pull/8151)
- [test] updated api-tests to use tmp directory for user data [#8151](https://github.com/eclipse-theia/theia/pull/8151)
- [vsx-registry] fixed the `licenseUrl` link for builtin and installed extensions [#8095](https://github.com/eclipse-theia/theia/pull/8095)
- [vsx-registry] improved styling of the detailed extension view [#8086](https://github.com/eclipse-theia/theia/pull/8086)
- [workspace] improved extensibility of menu and keybinding contributions [#8188](https://github.com/eclipse-theia/theia/pull/8188)
Breaking Changes:
- [core] fixed typo (`matchKeybiding` to `matchKeybinding`) in `KeybindingRegistry` [#8193](https://github.com/eclipse-theia/theia/pull/8193)
- [preferences] removed unused variable `PreferencesWidget.COMMAND_LABEL` [#8249](https://github.com/eclipse-theia/theia/pull/8249)
- [preferences] renamed file `preference-contribution.ts` to `preferences-contribution.ts` [#8237](https://github.com/eclipse-theia/theia/pull/8237)
- [terminal] fixed typo (`rezize` to `resize`) in `TerminalWidget` [#8193](https://github.com/eclipse-theia/theia/pull/8193)
<a name="1_4_0_replace_json"></a>
- [[json]](#1_4_0_replace_json) replaced `@theia/json` Theia extension with `vscode.json-language-features` VS Code extension [#8112](https://github.com/eclipse-theia/theia/pull/8112)
- You can register JSON validations at application startup by implementing `JsonSchemaContribution` Theia contribution point.
- Alternatively you can provide JSON validations using VS Code [contributes.jsonValidation](https://code.visualstudio.com/api/references/contribution-points#contributes.jsonValidation) contribution point.
<a name="1_4_0_absolute_user_storage_uri"></a>
- [[user-storage]](#1_4_0_absolute_user_storage_uri) settings URI must be an absolute to satisfy expectations of `vscode.json-language-features` [#8112](https://github.com/eclipse-theia/theia/pull/8112)
- If you implement a custom user storage make sure to check old relative locations, otherwise it can cause user data loss.
<a name="1_4_0_deprecate_languages"></a>
- [[languages]](#1_4_0_deprecate_languages) `@theia/languages` extension is deprecated, use VS Code extensions to provide language smartness:
https://code.visualstudio.com/api/language-extensions/language-server-extension-guide [#8112](https://github.com/eclipse-theia/theia/pull/8112)