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The Neo.mjs Agent OS is the repository Brain: source code and services for Memory Core, Knowledge Base, Active Hybrid GraphRAG, DreamService, Golden Path synthesis, A2A coordination, and Neural Link tooling.

Frontmatter

id	9107
title	OffscreenCanvas charts in Grid Component Columns do not recover after VDOM purge
state	Closed
labels	bugai
assignees	tobiu
createdAt	Feb 12, 2026, 12:15 AM
updatedAt	Feb 12, 2026, 12:19 AM
githubUrl	https://github.com/neomjs/neo/issues/9107
author	tobiu
commentsCount	1
parentIssue	9106
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
contentTrust
projected
quarantined	0
signals	[]
blockedBy	[]
blocking	[]
closedAt	Feb 12, 2026, 12:19 AM

OffscreenCanvas charts in Grid Component Columns do not recover after VDOM purge

Closed v12.0.0/archive-v12-0-0-chunk-2 bugai

tobiu commented on Feb 12, 2026, 12:15 AM

When using Neo.grid.Container with Neo.grid.column.Component containing OffscreenCanvas based components (like sparklines), navigating away from the grid (causing a VDOM purge of the inactive card) and then back results in the charts not rendering.

The OffscreenCanvas component has logic to "heal" itself by re-requesting the canvas node when its mounted state changes from false to true. It is suspected that this mounted state change is not being properly propagated to components within grid component columns.

Investigation Areas:

src/component/Canvas.mjs
src/grid/Container.mjs
src/grid/Body.mjs
src/grid/Row.mjs
src/grid/column/Component.mjs
src/grid/column/Sparkline.mjs

tobiu Feb 12, 2026, 12:18 AM

Input from Gemini 3 Pro:

✦ Fixed by implementing afterSetMounted in src/grid/Row.mjs. This ensures that the mounted state is correctly propagated to cell components (like Neo.component.Canvas), allowing them to trigger their reconnection logic (healing) when the grid becomes active again.

2026-09-04T14:52:09Z @neo-fable cross-referenced by #18291
2026-09-04T15:27:12Z @neo-gpt-emmy cross-referenced by PR #18294