Panel 1.9.4 is a patch release focused on rendering robustness for ESM/React components, several Tabulator and Pipeline fixes, OAuth hardening, and stylesheet/loading reliability improvements. It also adds support for movable Tabulator columns. Many thanks to @TheoMathurin, @rimsha152007-dotcom, @ebarkhordar, @SimonHeybrock, @ahuang11, @Kkkakania, @EltonChang1, @hoxbro, @MarcSkovMadsen, @Coderambling, @SuMayaBee, @youdie006, @kyo5uke, @ghostiee-11 and @philippjfr for contributing to this release. 🚀 Features Support movable Tabulator columns (#8685) 🎨 UI Improvements Align loading spinner with panel-material-ui (#8686) 🐛 Bug Fixes Report the pre-edit value on Tabulator value events (#8714) Raise a clear type error for unsupported Perspective objects (#8720) Fix Tabulator starts and ends header filters (#8719) Ensure ESM component child views aren't created concurrently (#8713) Inline versioned stylesheets on the notebook update path (#8708) Resolve invisible slider title font color in Fast theme's light mode (#8704) Various ESM component robustness fixes (#8702) Reveal markup panes when their stylesheets fail to load or are replaced (#8700) Drain held events once connected (#8698) Fix Tabulator row_content in panel-material-ui dynamic Tabs (#8697) Claim the Document thread before running app code (#8693) Ensure explicitly set sizing options are respected (#8687) Fix Feed rendering all objects at once (#8667) Fix repeated Location sync mappings (#8660) Fix Tabulator page size handling (#8657) Fix Fast theme Progress indicator height (#8652) Return a clean 403 for unauthenticated WebSocket connections (#8639) Set Cache-Control: no-store on the Bokeh document page (#8636) Forward additional oauth_extra_params to the OAuth authorization endpoint (#8635) Ensure Pipeline ready parameter and next button stay in sync after using the previous button (#8633) Ensure Pipeline previous button sets the correct stage in the graph (#8630) 📚 Documentation Add panel-live-server to docs Extensions gallery (#8703) Clarify FileDropper upload progress indicator documentation (#8684) Fix reactive row count in interactivity tutorial (#8683) Expand layout sizing controls documentation (#8682) Add Spacer reference notebook (#8681) Add ESM components card to explanation Components section (#8673) Fix typo and optimize phrasing (#8665) Fix the "Could not open websocket" / multiple-accounts OAuth troubleshooting guide (#8637) Document that JSON embed files must be served over HTTP (#8632)