fix(webview): omit originalContent from webview messages and fetch on demand by daewoongoh · Pull Request #1943 · Zoo-Code-Org/Zoo-Code

daewoongoh · 2026-10-06T07:00:16Z

Related GitHub Issue

Closes: #1885

Description

Host side: New src/core/webview/stripOriginalContent.ts (omitOriginalContent) replaces a file-edit tool message's originalContent with originalContentLength in ClineProvider before posting to the webview. Results are cached per message object (WeakMap keyed on text), so repeated state pushes don't re-parse. Empty originals (new files) are kept, because the webview treats them as "has an original". Non-JSON or truncated partial messages are left untouched.
On demand: FileChangesPanel sends a new readOriginalContent request when a diff is opened. webviewMessageHandler resolves the message by messageId (falling back to ts only for messages persisted without one, since ts can collide within a millisecond) and replies with originalContentInfo (null if unavailable). The request carries the taskId; the host answers null for another task and the panel ignores responses for a task that is not current. Pending requests are tracked per task and message, so switching tasks cannot send duplicates. fileChangesFromMessages reads originalContentLength.
Cache: only the stripped text is cached per message object, so metadata such as isAnswered and partial is always taken from the current message.
Tooling: scripts/gray-screen/* are the heap-measurement harnesses used below. They are dev-only and not shipped. The mock server validates --dir, the static servers are confined to their build directory (symlinks resolved), and generated tasks are written atomically.
For reviewers: Check that the null fallback and the empty-original case in FileChangesPanel behave correctly.

Test Procedure

Unit tests (all pass):

src (stripOriginalContent, webviewMessageHandler.readOriginalContent, ClineProvider): 3 files, 197 tests.
webview-ui (FileChangesPanel, fileChangesFromMessages): 2 files, 42 tests.

Real-Chromium heap test: production webview-ui build in headless Chromium, 15 s of driven updates, 50 KB pre-edit file per edit.

Scenario (50 KB file/edit)	Metric	Before (inline)	After (omitted)	Change
2000 edits, state push 2Hz	Hydration peak	458 MB	73 MB	-84%
	Peak heap	2647 MB	362 MB	-86%
	Heap after GC	861 MB	98 MB	-89%
	Result	ok	ok	-
2000 edits, streaming 30Hz	Hydration peak	460 MB	73 MB	-84%
	Peak heap	2377 MB	338 MB	-86%
	Heap after GC	440 MB	56 MB	-87%
	Result	ok	ok	-
6000 edits, state push 2Hz	Hydration peak	1283 MB	141 MB	-89%
	Peak heap	3432 MB	876 MB	-74%
	Heap after GC	- (crashed)	228 MB	-
	Result	CRASHED (renderer OOM) after 17.2 s	ok	fixed

The "Before" column is the behavior with originalContent inline. The "After" column is the behavior with it omitted. At 6000 edits the old behavior reproduces the gray screen, and the new one completes.

Pre-Submission Checklist

Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
Scope: My changes are focused on the linked issue (one major feature/fix per PR).
Self-Review: I have performed a thorough self-review of my code.
Testing: New and/or updated tests have been added to cover my changes (if applicable).
Visual Snapshot (UI changes only): Not applicable, no visible UI change.
Documentation Impact: I have considered if my changes require documentation updates.
Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Visual Snapshots

N/A

Videos (interaction / animation only)

N/A

Documentation Updates

No documentation updates are required.

Additional Notes

Complements feat(webview): incremental clineMessages delivery for focused task #630 (incremental message delivery), which targets payload size with a different approach.
Related: [BUG] Gray Screen #1675, [BUG] Completely crashes and turns into a blank grey screen during autonomous tasks. #448, fix(webview): throttle state pushes to prevent gray screen OOM at high message counts #629.
Supersedes fix(webview): omit originalContent from webview messages and fetch on demand #1886 (closed), re-opened with the commits squashed into one.
The matrix's omitOriginal flag simulates the omission in the harness, so the numbers show the effect of the omission rather than this PR's exact code path.

… demand Strip originalContent (the whole pre-edit file) from file-edit tool messages before they are posted to the webview, and let FileChangesPanel request it on demand by messageId and taskId. This keeps the webview heap from growing with the total size of edited files, which could end in a gray screen (OOM). Also adds the scripts/gray-screen heap-measurement tooling.

Keep loaded originals across message updates and skip requests for rows expanded under a previous task. Pass currentTaskId to FileChangesPanel. Move shared tooling helpers to lib.mjs: validate numeric flags and --dir (no "." or option-like segments), stage generated tasks in a separate directory before renaming them into place, and add node:test coverage.

… tools Only build into the fixed production/development temp directories (Vite empties the output directory), never into a symlink. Add subprocess and HTTP tests for generate-large-task, analyze-session and mock-openai-server, and make analyze-session skip tasks whose ui_messages.json cannot be parsed.

These were investigation scripts for the webview gray-screen issue and are no longer needed now that the originalContent fix has landed.

coderabbitai · 2026-10-06T07:00:25Z

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packages/types/src/vscode-extension-host.ts
src/core/webview/ClineProvider.ts
src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
webview-ui/src/__tests__/FileChangesPanel.spec.tsx

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For persisted settings, verify the complete schema/storage/runtime/webview round trip, shared default semantics, and focused true plus false/unset tests.

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src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/ClineProvider.ts
packages/types/src/vscode-extension-host.ts

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src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
webview-ui/src/__tests__/FileChangesPanel.spec.tsx

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src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/ClineProvider.ts
webview-ui/src/__tests__/FileChangesPanel.spec.tsx
packages/types/src/vscode-extension-host.ts

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webview-ui/src/__tests__/FileChangesPanel.spec.tsx

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

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src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/ClineProvider.ts

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Files:

src/core/webview/__tests__/ClineProvider.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/ClineProvider.ts
webview-ui/src/__tests__/FileChangesPanel.spec.tsx
packages/types/src/vscode-extension-host.ts

🔇 Additional comments (1)

webview-ui/src/__tests__/FileChangesPanel.spec.tsx (1)

250-259: LGTM!

📝 Summary

Summary by CodeRabbit

New Features
- File change diffs can load original file content when you expand a change, providing a more complete comparison with the final content.
- Original content is matched to the relevant message and task to keep it associated with the correct change.
Bug Fixes
- Recorded diffs remain visible when original content is unavailable or fails to load.

Walkthrough

The extension replaces non-empty original file content in webview messages with its character length. The File Changes panel can request omitted content by message and task identifiers, then use a matching response to display the diff.

Changes

Original file content flow

Layer / File(s)	Summary
Omit original content from extension messages `packages/types/src/vscode-extension-host.ts`, `src/core/webview/stripOriginalContent.ts`, `src/core/webview/ClineProvider.ts`, `src/core/webview/__tests__/*`	The message contracts include omitted-content metadata. Before posting, the extension replaces eligible non-empty `originalContent` strings with their lengths. Tests cover transformations and posted state and update messages.
Handle original-content requests `src/core/webview/webviewMessageHandler.ts`, `src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts`	The extension looks up content by timestamp and optional message ID in the current task. It returns null for unmatched content or a mismatched task, and ignores requests without a numeric timestamp.
Load original content in the File Changes panel `webview-ui/src/components/chat/ChatView.tsx`, `webview-ui/src/components/chat/FileChangesPanel.tsx`, `webview-ui/src/components/chat/utils/fileChangesFromMessages.ts`, `webview-ui/src/__tests__/*`	File-change entries include message identity and indicate whether original content is available. The panel requests omitted content for expanded rows, associates requests and responses with tasks and messages, and uses matching content to display diffs.

Priority: ⬆️ High

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: hannesrudolph

Merge Risk: ⚪ Minimal · up to b5dae

The change omits original file content from normal webview messages and retrieves it for expanded diffs. No merge-blocking issue is established in the reviewed paths; the PR is mergeable subject to normal checks.

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Regression Evidence		Focused regression coverage is present at the lowest valid layers. Host tests cover stripping for state and messageUpdated messages, source-message immutability, empty/non-string/malformed content, ca…
Security Boundaries		No concrete security-boundary failure is introduced. The changed `readOriginalContent` path stays within `provider.getCurrentTask()` and returns content only for the allowlisted file-edit tools (`edit…
Persistence Integrity		No changed persistence path exists. The authoritative diff changes outbound webview transformation, in-memory lookup/cache, message handling, and webview state. It does not add or modify task writes, …
Lifecycle Resource Cleanup		No concrete changed lifecycle leak or post-cancellation duplication is present. `FileChangesPanel` registers one `window` message listener and removes it in the effect cleanup at lines 125-143; changi…
Title check		The title clearly identifies the primary change: omitting originalContent from webview messages and fetching it on demand.
Description check		The description follows the repository template. It links issue `#1885`, explains the implementation, documents test results, records scope and documentation decisions, and identifies reviewer focus are…
Linked Issues check		The pull request links issue `#1885` with a valid Closes reference. The described implementation matches the issue objective.
Out of Scope Changes check		The changes remain focused on reducing webview memory use through deferred original-content retrieval. The heap-test harnesses support validation of this objective and are described as development-onl…

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codecov · 2026-10-06T07:12:07Z

Codecov Report

❌ Patch coverage is 97.10145% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/webview/stripOriginalContent.ts	96.55%	1 Missing ⚠️
...ebview-ui/src/components/chat/FileChangesPanel.tsx	96.55%	0 Missing and 1 partial ⚠️

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github-actions · 2026-10-06T07:13:08Z

Review status

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Review-state labels are managed by this workflow; do not edit them manually. community-approved is managed the same way — do not add or remove it manually. It signals a fresh community code approval for the current head as an advisory priority only; maintainer review is still required.

coderabbitai

Pre-merge checks failed. Please resolve the failing checks before merging.

readOriginalContent could return the pre-edit file for a pending or denied approval, bypassing the isAnswered filter the webview applies. Restrict lookup to answered, non-partial file-edit tool messages and return null otherwise.

coderabbitai

Actionable comments posted: 1

🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/core/webview/stripOriginalContent.ts:
- Around line 56-68: Update the ask-message guard in findOriginalContent to
reject messages whose autoApprovalDecision is "deny", including asks already
marked answered. Preserve the existing checks for missing text, partial
messages, and unanswered asks.

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src/core/webview/__tests__/stripOriginalContent.spec.ts
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src/core/webview/stripOriginalContent.ts

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For persisted settings, verify the complete schema/storage/runtime/webview round trip, shared default semantics, and focused true plus false/unset tests.

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src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/stripOriginalContent.ts

Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

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src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts

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src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/stripOriginalContent.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

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src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/stripOriginalContent.ts

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src/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.ts
src/core/webview/__tests__/stripOriginalContent.spec.ts
src/core/webview/stripOriginalContent.ts

🪛 GitHub Check: mutation-diff

src/core/webview/stripOriginalContent.ts

[warning] 7-7: Mutation test advisory
src/core/webview/stripOriginalContent.ts:7: 4 mutation test gaps; example: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.

[warning] 65-65: Mutation test advisory
src/core/webview/stripOriginalContent.ts:65: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

edelauna

Thanks for this fix!

daewoongoh added 4 commits October 2, 2026 15:41

chore(scripts): remove gray-screen debugging tools

59cd5c2

These were investigation scripts for the webview gray-screen issue and are no longer needed now that the originalContent fix has landed.

daewoongoh requested review from JamesRobert20, edelauna, navedmerchant and taltas as code owners October 6, 2026 07:00

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Merge branch 'main' into fix/webview-omit-original-content

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test(webview): close mutation gaps in original content tests

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2anoubis mentioned this pull request Oct 12, 2026

[BUG] Chat hides the assistant text before ask_followup_question until the user answers (3.88.0) #2011

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daewoongoh deleted the fix/webview-omit-original-content branch October 13, 2026 00:52

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fix(webview): omit originalContent from webview messages and fetch on demand - #1943

fix(webview): omit originalContent from webview messages and fetch on demand#1943
edelauna merged 7 commits into
Zoo-Code-Org:mainfrom
daewoongoh:fix/webview-omit-original-content

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daewoongoh commented Oct 6, 2026

Related GitHub Issue

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