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fix(web): file previews stop reloading after every agent command - #508
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October 29, 2026 13:44
… command The right-panel preview keyed its frame on the thread's workspace mutation id, which changes whenever the agent finishes any command or a checkpoint lands, so a viewed HTML page flashed and jumped back to the top while the agent worked. Workspace-file asset URLs now carry the file's revision (as media files already do) and the preview re-mints on each mutation but reloads only when that revision changes. The PDF viewer keeps its first URL across re-signing too. Loom-Thread: thread:mcp:8d3b033d-e49c-431e-9c2c-155901c3c8ee:workstream-spawn:6e3098ff-f642-432a-9d89-0c08ecec56f2 Pi-Session: /home/Carl/.pi/agent/sessions/--home-Carl-.t3-cockpit-worktrees-loom-t3-59d4ac6f--/2026-10-29T02-26-28-621Z_01a1857a-ee8b-722f-9b57-384ffc508649.jsonl Pi-Session: 01a1857a-ee8b-722f-9b57-384ffc508649
Loom-Thread: thread:mcp:8d3b033d-e49c-431e-9c2c-155901c3c8ee:workstream-spawn:7feceeb5-de7a-4c8b-a660-ce579d054f0e Pi-Session: /home/Carl/.pi/agent/sessions/--home-Carl-.t3-cockpit-worktrees-loom-t3-59d4ac6f--/2026-10-29T02-44-31-913Z_01a1858b-7625-775b-8e30-9011bd56be69.jsonl Pi-Session: 01a1858b-7625-775b-8e30-9011bd56be69
…ent command The right-panel image preview put the thread's workspace mutation id in the image URL, so every finished command fetched the image again. It now re-mints on each mutation but keeps the shown URL until the file's revision changes, which also stops the periodic URL renewal from re-downloading it. Loom-Thread: thread:mcp:8d3b033d-e49c-431e-9c2c-155901c3c8ee:workstream-spawn:6e3098ff-f642-432a-9d89-0c08ecec56f2 Pi-Session: /home/Carl/.pi/agent/sessions/--home-Carl-.t3-cockpit-worktrees-loom-t3-59d4ac6f--/2026-10-29T02-50-36-289Z_01a18591-057f-7556-a7c4-a13420d45f17.jsonl Loom-Thread: thread:mcp:53ba6d00-fbe5-4f17-a70b-fd9fd70a4f63:workstream-scaffold:178b6d6f-dbd6-48c7-8903-bee1a327e13c:0 Pi-Session: 01a18591-057f-7556-a7c4-a13420d45f17
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Problem: viewing an HTML, PDF or image file in the workspace preview flickered and reset scroll to the top after every agent command, because the preview URL was revalidated/reloaded each time the workspace changed.
Fix: previews now only reload when the file itself changes (HTML/PDF: cbba86f, c1c6e58; images: cc7e603). Verified live in a running dev instance.
Built with pi (Claude).
Loom-Summary: HTML, PDF and image file previews no longer reload or jump to the top after each agent command
Loom-Kind: noticeable