fix(webview): omit originalContent from webview messages and fetch on demand - #1943
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daewoongoh wants to merge 6 commits into
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… 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.
daewoongoh
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JamesRobert20,
edelauna,
navedmerchant and
taltas
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October 6, 2026 07:00
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📝 SummarySummary by CodeRabbit
WalkthroughThe 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. ChangesOriginal file content flow
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant FileChangesPanel
participant webviewMessageHandler
participant findOriginalContent
participant CurrentTaskMessages
FileChangesPanel->>webviewMessageHandler: readOriginalContent request
webviewMessageHandler->>findOriginalContent: Look up content by timestamp and optional message ID
findOriginalContent->>CurrentTaskMessages: Search tool messages
CurrentTaskMessages-->>findOriginalContent: Matching message data
findOriginalContent-->>webviewMessageHandler: Original content or null
webviewMessageHandler-->>FileChangesPanel: originalContent response
Merge Risk: 🔵 Low · up to A denied file edit can still expose its pre-edit content to the webview. Reject auto-denied asks in the lookup before merging. 🚥 Pre-merge checks | ✅ 8✅ Passed checks (8 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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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.
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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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📒 Files selected for processing (3)
src/core/webview/__tests__/stripOriginalContent.spec.tssrc/core/webview/__tests__/webviewMessageHandler.readOriginalContent.spec.tssrc/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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🪛 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.
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Related GitHub Issue
Closes: #1885
Description
src/core/webview/stripOriginalContent.ts(omitOriginalContent) replaces a file-edit tool message'soriginalContentwithoriginalContentLengthinClineProviderbefore 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.FileChangesPanelsends a newreadOriginalContentrequest when a diff is opened.webviewMessageHandlerresolves the message bymessageId(falling back totsonly for messages persisted without one, sincetscan collide within a millisecond) and replies withoriginalContentInfo(nullif unavailable). The request carries thetaskId; the host answersnullfor 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.fileChangesFromMessagesreadsoriginalContentLength.isAnsweredandpartialis always taken from the current message.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.nullfallback and the empty-original case inFileChangesPanelbehave 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.
The "Before" column is the behavior with
originalContentinline. 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
Visual Snapshots
N/A
Videos (interaction / animation only)
N/A
Documentation Updates
Additional Notes
omitOriginalflag simulates the omission in the harness, so the numbers show the effect of the omission rather than this PR's exact code path.