Add CHANGELOG entry for 1.6.3

[philippjfr]

This release introduces a number of performance improvements related to rendering of children in layouts and ESM components, a number of bug fixes and a number of documentation improvements. We are pleased to welcome @malemburg as a new contributor and want to thank @s-alexey, @Coderambling, @etihwo and our core maintainer team including @hoxbro, @ahuang11, @MarcSkovMadsen and @philippjfr for their contributions to this release.

Enhancements

• Implement smarter Column child rendering #7846
• Optimize ReactComponent child renders #7828
• Add indent and soft_tabs options to CodeEditor #7831
• Allow creating Param.widget without instantiating object, speeding up Widget.from_param #7867

Bug fixes

• Fix handling of React based AnyWidgetComponent types #7820
• Cache ESM render modules #7827
• Check for None in select function for PyComponent #7837
• Fix for AttributeError in auth.py:CodeChallenge OAuth login #7844
• Fix error when old_objects is empty in _get_objects() #7842
• Ensure ReactiveESM renders elements #7853
• Ensure ESM shared resources are watched properly #7856
• Fix Material design Tabulator header color #7855
• Ensure current view and selection lookups on Tabulator handle None case #7858
• Ensure Modal events are targeted to correct model #7860
• Ensure ChatFeed has inherent height #7861
• Ensure Markdown code blocks are always left aligned #7862
• Gracefully handle ECharts delayed rendering #7869

Documentation

• List version agnostic wheel URLs in WASM standalone docs #7857
• Correct ClassSelector keyword in build_todo.md #7819
• Fix documentation of --oauth-extra-params #7865
• Fix minor issues in FastAPI docs #7866
• Clarify OAuth redirect uri #7868

[Coderambling]

Should the issue below be added to the list of bug fixes?

#7854

Or is that covered by this one, that is already mentioned in the Bug fixes?

Ensure we use CDN resources in pyodide (#7638)

[github-actions]

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