[LeeO86]

Adrian's round 2026-10-23, item 2.

• Console shows why Program fell back to the mosaic: the PROGRAM title gets an amber note from the mosaic: <reason> when GET /preview → streams_error is set (the engine could not open the Program streams' NVENC sessions).
• Box editor over an inset mosaic tile (~1 % off): preview.ts rasterView() gives the part of the raster a picture shows (all of it for a Program stream; 5 mosaic px less at each edge for a tile, e.g. 20 raster px of 1920 for a 480-px tile); BoxEditor takes it as view and maps boxes and drags to it.
• POST /config/import checks snapshot crops: a snapshot's DME crop that leaves no picture is refused (409/422) like a keyer's (restore still repairs it).
• Crop drift on repeated format changes: a crop not changed since an earlier format change is scaled from its value then (its base, kept for the session), e.g. 481 px at 1080p → 321 at 720p → 481 again (was 482); a crop changed in between is scaled from its new value.
• T-bar edges and source cap: the deadband's edges count (<=/>=, with a 1e-9 tolerance: 1 − 0.98 is 0.020000000000000018 in floats), server and GUI; at most 64 hardware levers (source) per ME are kept for the pickup (the oldest picks up again).

Tests

• pytest: test_back_and_forth_format_changes_do_not_drift, test_an_import_refuses_a_snapshot_crop_that_leaves_no_picture, test_the_snap_edges_are_inclusive, test_at_most_64_hardware_levers_per_me_are_kept.
• check-preview.ts: rasterView for a stream, a tile and no map.
• Docs: README (Pictures, T-bar sources), CHANGELOG.

Independent of the raw-tally PR (both touch the top of CHANGELOG; whichever merges second needs a one-line rebase).

🤖 Generated with Claude Code

https://claude.ai/code/session_01St7QwmonpoG9EEEqaLFXLi