v0.27.0

• Added support for dynamic theme loading. #2759
• Added an application splash screen. #2899
• Enhancements to the settings editor. #2784
• Added a PDF viewer. #2867
• Numerous bug fixes and style improvements.

v0.26.0

• Implemented server side handling of users settings: #2585
• Revamped the handling of file types in the application - affects document and mime renderers: #2701
• Updated dialog API - uses virtual DOM instead of raw DOM nodes and better use of the widget lifecycle: #2661

v0.25.0

• Added a new extension type for mime renderers, with the vega2-extension as a built-in example. Also overhauled the rendermime interfaces.
  #2488
  #2555
  #2595
• Finished JSON-schema based settings system, using client-side storage for now.
  #2411
• Overhauled the launcher design.
  #2506
  #2580
• Numerous bug fixes and style updates.

v0.24.0

• Overhaul of the launcher. #2380
• Initial implementation of client-side settings system. #2157
• Updatable outputs. #2439
• Use new Phosphor Datagrid for CSV viewer. #2433
• Added ability to enable/disable extensions without rebuilding. #2409
• Added language and tab settings for the file viewer. #2406
• Improvements to real time collaboration experience. #2387 #2333
• Compatibility checking for extensions. #2410
• Numerous bug fixes and style improvements.

v0.23.0

• Chat box feature. #2118
• Collaborative cursors. #2139
• Added concept of Drive to ContentsManager. #2248
• Refactored to enable switching the theme. #2283
• Clean up the APIs around kernel execution. #2266
• Various bug fixes and style improvements.

0.22.0

• Export To... for notebooks. #2200
• Change kernel by clicking on the kernel name in the notebook. #2195
• Improved handling of running code in text editors. #2191
• Can select file in file browser by typing: #2190
• Ability to open a console for a notebook. #2189
• Upgrade to Phosphor 1.2 with Command Palette fuzzy matching improvements. #1182
• Rename of widgets that had Widget in the name and associated package names. #2177
• New jupyter labhub command to launch JupyterLab on JupyterHub: #2222
• Removed the utils from @jupyterlab/services in favor of PageConfig and ServerConnection. #2173 #2185
• Cleanup, bug fixes, and style updates.

0.20.0

Release Notes:

• Overhaul of extension handling, see updated docs for users and developers. #2023
• Added single document mode and a Tabs sidebar. #2037
• More work toward real time collaboration - implemented a model database interface that can be in-memory by real time backends. #2039

Numerous bug fixes and improvements.

Release 0.19

Mainly backend-focused release with compatibility with Phosphor 1.0 and a big refactor of session handling (the ClientSession class) that provides a simpler object for classes like notebooks, consoles, inspectors, etc. to use to communicate with the API. Also includes improvements to the development workflow of JupyterLab itself after the big split.

#1984
#1927

Version 0.18

• Split the repository into multiple packages that are managed using the
  lerna build tool. #1773
• Added restoration of main area layout on refresh. #1880
• Numerous bug fixes and style updates.

0.17.0

• Upgrade to new @phosphor packages - brings a new Command Palette interaction that should be more intuitive, and restores the ability to drag to dock panel edges #1762.
• Refactor of RenderMime and associated renders to use live models. See #1709 and #1763.
• Improvements and bug fixes for the completer widget: #1778
• Upgrade CodeMirror to 5.23: #1764
• Numerous style updates and bug fixes.