What's Changed

New Features 🎉

• [AdvancedLayouts] Add width to st.plotly_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12559
• Feat: Automatically hide row indices in st.dataframe when row selection is active by @plumol in https://github.com/streamlit/streamlit/pull/12448
• [AdvancedLayouts] Add width to st.vega_lite_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12517
• Add codeTextColor config & update linkColor by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12562
• [AdvancedLayouts] Add height to st.vega_lite_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12577
• [AdvancedLayouts] Add width to st.pydeck_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12576
• Use key as main identity for st.color_picker by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12569
• Add type argument to st.popover to match st.button by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12598
• [AdvancedLayouts] Add width to st.altair_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12608
• Add cursor kwarg to st.write_stream by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12597
• In streamlit hello, preload Python modules that are slow to compile in a fresh venv by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12617
• Reusable Custom Themes via theme.base config by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12572
• Make streamlit run with no args mean streamlit run streamlit_app.py by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12599
• Allow st.feedback to have a default initial value (#9469) -> #9658 by @andreasntr in https://github.com/streamlit/streamlit/pull/12578
• [AdvancedLayouts] Add height to st.altair_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12630
• [AdvancedLayouts] Modernize height parameter for st.pydeck_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12613
• [AdvancedLayouts] Update width and height on st.map by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12658
• [AdvancedLayouts] Modernize width/height parameters for st.scatter_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12659
• [AdvancedLayouts] Modernize width and height for st.area_chart and st.bar_chart by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12672
• Custom Dark Theme - add light/dark section configurations for theme & theme.sidebar by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12680
• Use key as main identity for st.segmented_control widget by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12711
• Use key as main identity for st.radio widget by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12705
• Use key as main identity for st.audio_input widget by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12720
• Add pinned parameter to MultiselectColumn by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12714
• Use key as main identity for st.slider and st.select_slider by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12575
• Custom Dark Theme - support light/dark config inheritance & populate new session msg by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12707
• Use key as main identity for st.chat_input widget by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12725
• Add support for auto color to MutliselectColumn using chart colors by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12724
• Allow configuring color for ProgressColumn by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12738
• Use key as main identity for st.feedback and st.pills widgets by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12717
• [AdvancedLayouts] Add stretch height to st.dataframe by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12632
• Custom Dark Theme - theme & sidebar theme creation by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12760
• Custom Dark Theme - main & settings menu updates by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12761
• [feat] Add API for st.space by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12737
• [feat] Add st.components.v2.components namespace and classes by @sfc-gh-bnisco in https://github.com/streamlit/streamlit/pull/12686

Bug Fixes 🐛

• Make slider thumbs not overshoot the track by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12549
• Fix vega chart unrecognized dataset error by @lukasmasuch in https://github.com/streamlit/streamlit/pull/11911
• [fix] Add AbortController for async upload operations by @sfc-gh-nbellante in https://github.com/streamlit/streamlit/pull/12539
• Fix PlotlyChart flickering by adding overflow hidden by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12594
• Pills do not show selected value(s) if disabled #12388 by @davidsjoberg1 in https://github.com/streamlit/streamlit/pull/12555
• Make our Python Altair code thread-safe by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12673
• Fix file watcher issue with common path check by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12741
• [fix] showErrorDetails config parsing for deprecation warnings by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12794
• Make sure error message is explicitly shown for 500 errors by @kmcgrady in https://github.com/streamlit/streamlit/pull/12845
• Makes fuzzy search case insensitive by @kmcgrady in https://github.com/streamlit/streamlit/pull/12849
• [fix] DataFrame content width horizontal alignment by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12682
• [fix] pyplot/image width regression in fragments, containers by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12807

Other Changes

• Update vega_lite_chart width parameter default handling for type consistency by @sfc-gh-lwilby in https://github.com/streamlit/streamlit/pull/12595
• [chore] Release v1.50.0 by @github-actions[bot] in https://github.com/streamlit/streamlit/pull/12612
• Settings menu updates by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12648
• [chore] Update emojis/material icons by @github-actions[bot] in https://github.com/streamlit/streamlit/pull/12669
• Clarify dataframe data types when starting with empty columns by @sfc-gh-dmatthews in https://github.com/streamlit/streamlit/pull/12779
• Selection widgets return copies by @sfc-gh-dmatthews in https://github.com/streamlit/streamlit/pull/12778
• Fix grammar/typos in config documentation by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/12783
• Remove Python 3.9 support by @lukasmasuch in https://github.com/streamlit/streamlit/pull/12773
• Custom Dark Theme - section updates & e2e tests by @mayagbarnes in https://github.com/streamlit/streamlit/pull/12798

New Contributors

• @andreasntr made their first contribution in https://github.com/streamlit/streamlit/pull/12578
• @davidsjoberg1 made their first contribution in https://github.com/streamlit/streamlit/pull/12555
• @ben05allen made their first contribution in https://github.com/streamlit/streamlit/pull/12652

Full Changelog: https://github.com/streamlit/streamlit/compare/1.50.0...1.51.0