This release primarily addresses regressions introduced in 0.14.0 and various long standing bugs. Many thanks to external contributors @liu-kan and @KedoKudo and the maintainers @Hoxbro, @maximlt and @philippjfr for contributing a number of fixes.
### Minor enhancements
- Improve support for requests in pyodide (#3973)
- Add option to clear value of DatetimePicker (#3990)
- Add support for hashing dates in pn.cache (#4004)
- Silence EMPTY_LAYOUT warnings (#4056)
### Compatibility
- Fix Jupyterlite and latest PyScript compatibility (#4040)
### Bugs
#### Webassembly conversion
- Correctly handle resource mode in when converting to WebAssembly (#3967)
### Jupyter and Server
- Correctly handle future exceptions on threads (#3977)
- Fix panel serve index template (#3980)
- Do not error if curdoc has been destroyed (#3994)
- Ensure extensions loaded in jupyter kernel are served by StaticHandler (#4000)
- Various fixes for OAuth handling with pn.serve (#4006)
- Fix bug in on_load callback exception handling (#4007)
- Ensure periodic callbacks are only started on main thread (#4011)
- Ensure jupyter server extension handles explicit root_dir (#4029)
- Ensure futures are correctly awaited when executed on thread (#4031)
#### Components
- Ensure Tabulator handles filtering on edited values correctly if show_index=False (#3988, #4016)
- Ensure Tabulator declares numeric sorter for numeric dtypes (#3999)
- Fix regression initializing DiscreteSlider with non-integer value (#4009)
- Ensure that template.config.raw_css is correctly applied (#4018)
- Fix handling MenuButton clicks when split=True (#4021)
- Ensure styling on Tabulator with empty DataFrame does not error (#4028)
- Allow changing level on Debugger widget (#4057