- Rename VERTICAL camera mode to FEED (rapid single-item view)
- Add SCROLL camera mode with float accumulation for smooth movie-credits style scrolling
- Add estimate_block_height() for cheap layout calculation without full rendering
- Replace ViewportFilterStage with layout-aware filtering that tracks camera position
- Add render caching to FontStage to avoid re-rendering items
- Fix CameraStage to use global canvas height for scrolling bounds
- Add horizontal padding in Camera.apply() to prevent ghosting
- Add get_dimensions() to MultiDisplay for proper viewport sizing
- Fix PygameDisplay to auto-detect viewport from window size
- Update presets to use scroll camera with appropriate speeds
BUG FIXES:
1. Border parameter not being passed to display.show()
- Display backends support border parameter but app.py wasn't passing it
- Now app.py passes params.border to display.show(border=params.border)
- Enables border-test preset to actually render borders
2. WebSocket and Multi displays didn't support border parameter
- Updated WebSocket Protocol to include border parameter
- Updated MultiDisplay.show() to accept and forward border parameter
- Updated test to expect border parameter in mock calls
3. app.py didn't properly handle special sources (empty, pipeline-inspect)
- Border-test preset with source='empty' was still fetching headlines
- Pipeline-inspect source was never using the introspection data source
- Now app.py detects special sources and uses appropriate data source stages:
* 'empty' source → EmptyDataSource stage
* 'pipeline-inspect' → PipelineIntrospectionSource stage
* Other sources → traditional items-based approach
- Uses SourceItemsToBufferStage for special sources instead of RenderStage
- Sets pipeline on introspection source after build to avoid circular dependency
TESTING:
- All 463 tests pass
- Linting passes
- Manual test: `uv run mainline.py --preset border-test` now correctly shows empty source
- border-test preset now properly initializes without fetching unnecessary content
The issue was that the enhanced app.py code from the original diff didn't make it into
the refactor commit. This fix restores that functionality.
