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fix: background editing bugs with PREVENT_FOCUS_DISRUPTION flag
Root cause fixes for user-reported issues: 1. Files opening in editor tabs during background editing 2. 'Unsaved changes' prompts when closing tabs after background edits Changes: - WriteToFileTool: add missing saveDirectly() call (primary bug - code fell through to duplicated else-branch that opened diff view instead) - EditFileTool: fix openFile parameter from isNewFile (true for new files) to false - ApplyDiffTool, SearchReplaceTool, EditTool: add isWriteProtected parameter for consistency across all tool implementations - ApplyPatchTool: add isWriteProtected + remove broken duplicate function stub (syntax error on lines 232-255) - DiffViewProvider.saveDirectly(): add content verification with retry logic, user edit detection via getText(), protected file override, auto-approval check - Tests: update saveDirectly tests with fs/promises mocks All 8 files changed are directly related to background editing behavior and work in conjunction with the PREVENT_FOCUS_DISRUPTION experiment flag.
1 parent 71db2e6 commit 55076fa

8 files changed

Lines changed: 242 additions & 35 deletions

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‎src/core/tools/ApplyDiffTool.ts‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -173,7 +173,6 @@ export class ApplyDiffTool extends BaseTool<"apply_diff"> {
173173
return
174174
}
175175

176-
// Save directly without showing diff view or opening the file
177176
task.diffViewProvider.editType = "modify"
178177
task.diffViewProvider.originalContent = originalContent
179178
await task.diffViewProvider.saveDirectly(
@@ -182,6 +181,7 @@ export class ApplyDiffTool extends BaseTool<"apply_diff"> {
182181
false,
183182
diagnosticsEnabled,
184183
writeDelayMs,
184+
isWriteProtected,
185185
)
186186
} else {
187187
// Original behavior with diff view

‎src/core/tools/ApplyPatchTool.ts‎

Lines changed: 9 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -213,7 +213,6 @@ export class ApplyPatchTool extends BaseTool<"apply_patch"> {
213213
return
214214
}
215215

216-
// Save the changes
217216
if (isPreventFocusDisruptionEnabled) {
218217
await task.diffViewProvider.saveDirectly(relPath, newContent, true, diagnosticsEnabled, writeDelayMs)
219218
} else {
@@ -407,14 +406,14 @@ export class ApplyPatchTool extends BaseTool<"apply_patch"> {
407406
return
408407
}
409408

410-
// Save new content to the new path
411409
if (isPreventFocusDisruptionEnabled) {
412410
await task.diffViewProvider.saveDirectly(
413411
change.movePath,
414412
newContent,
415413
false,
416414
diagnosticsEnabled,
417415
writeDelayMs,
416+
isMovePathWriteProtected,
418417
)
419418
} else {
420419
// Write to new path and delete old file
@@ -434,7 +433,14 @@ export class ApplyPatchTool extends BaseTool<"apply_patch"> {
434433
} else {
435434
// Save changes to the same file
436435
if (isPreventFocusDisruptionEnabled) {
437-
await task.diffViewProvider.saveDirectly(relPath, newContent, false, diagnosticsEnabled, writeDelayMs)
436+
await task.diffViewProvider.saveDirectly(
437+
relPath,
438+
newContent,
439+
false,
440+
diagnosticsEnabled,
441+
writeDelayMs,
442+
isWriteProtected,
443+
)
438444
} else {
439445
await task.diffViewProvider.saveChanges(diagnosticsEnabled, writeDelayMs)
440446
}

‎src/core/tools/EditFileTool.ts‎

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -434,15 +434,18 @@ export class EditFileTool extends BaseTool<"edit_file"> {
434434
return
435435
}
436436

437-
// Save the changes
438437
if (isPreventFocusDisruptionEnabled) {
439438
// Direct file write without diff view or opening the file
439+
// Background editing: always pass openFile=false to prevent focus disruption;
440+
// file is written via fs.writeFile and VSCode dirty state is resolved via
441+
// openTextDocument + doc.save()
440442
await task.diffViewProvider.saveDirectly(
441443
relPath,
442444
newContent,
443-
isNewFile,
445+
false,
444446
diagnosticsEnabled,
445447
writeDelayMs,
448+
isWriteProtected,
446449
)
447450
} else {
448451
// Call saveChanges to update the DiffViewProvider properties

‎src/core/tools/EditTool.ts‎

Lines changed: 8 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -209,10 +209,16 @@ export class EditTool extends BaseTool<"edit"> {
209209
return
210210
}
211211

212-
// Save the changes
213212
if (isPreventFocusDisruptionEnabled) {
214213
// Direct file write without diff view or opening the file
215-
await task.diffViewProvider.saveDirectly(relPath, newContent, false, diagnosticsEnabled, writeDelayMs)
214+
await task.diffViewProvider.saveDirectly(
215+
relPath,
216+
newContent,
217+
false,
218+
diagnosticsEnabled,
219+
writeDelayMs,
220+
isWriteProtected,
221+
)
216222
} else {
217223
// Call saveChanges to update the DiffViewProvider properties
218224
await task.diffViewProvider.saveChanges(diagnosticsEnabled, writeDelayMs)

‎src/core/tools/SearchReplaceTool.ts‎

Lines changed: 8 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -205,10 +205,16 @@ export class SearchReplaceTool extends BaseTool<"search_replace"> {
205205
return
206206
}
207207

208-
// Save the changes
209208
if (isPreventFocusDisruptionEnabled) {
210209
// Direct file write without diff view or opening the file
211-
await task.diffViewProvider.saveDirectly(relPath, newContent, false, diagnosticsEnabled, writeDelayMs)
210+
await task.diffViewProvider.saveDirectly(
211+
relPath,
212+
newContent,
213+
false,
214+
diagnosticsEnabled,
215+
writeDelayMs,
216+
isWriteProtected,
217+
)
212218
} else {
213219
// Call saveChanges to update the DiffViewProvider properties
214220
await task.diffViewProvider.saveChanges(diagnosticsEnabled, writeDelayMs)

‎src/core/tools/WriteToFileTool.ts‎

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -133,7 +133,15 @@ export class WriteToFileTool extends BaseTool<"write_to_file"> {
133133
return
134134
}
135135

136-
await task.diffViewProvider.saveDirectly(relPath, newContent, false, diagnosticsEnabled, writeDelayMs)
136+
// Direct file write without opening diff view (background editing)
137+
await task.diffViewProvider.saveDirectly(
138+
relPath,
139+
newContent,
140+
false,
141+
diagnosticsEnabled,
142+
writeDelayMs,
143+
isWriteProtected,
144+
)
137145
} else {
138146
if (!task.diffViewProvider.isEditing) {
139147
const partialMessage = JSON.stringify(sharedMessageProps)

‎src/integrations/editor/DiffViewProvider.ts‎

Lines changed: 79 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -645,38 +645,87 @@ export class DiffViewProvider {
645645
openFile: boolean = true,
646646
diagnosticsEnabled: boolean = true,
647647
writeDelayMs: number = DEFAULT_WRITE_DELAY_MS,
648+
isWriteProtected: boolean = false,
648649
): Promise<{
649650
newProblemsMessage: string | undefined
650651
userEdits: string | undefined
651652
finalContent: string | undefined
652653
}> {
653654
const absolutePath = path.resolve(this.cwd, relPath)
654655

656+
// Protected files must always show diff view for manual review,
657+
// even when background editing is enabled. This prevents accidental
658+
// modification of sensitive configuration files.
659+
if (isWriteProtected && !openFile) {
660+
openFile = true
661+
}
662+
663+
// When auto-approval is disabled, force showing the file so the user
664+
// can review changes. Background editing only makes sense when writes
665+
// are auto-approved (#8736).
666+
if (!openFile) {
667+
const task = this.taskRef.deref()
668+
const provider = task?.providerRef.deref()
669+
if (provider) {
670+
const state = await provider.getState()
671+
if (!state?.autoApprovalEnabled) {
672+
openFile = true
673+
}
674+
}
675+
}
676+
655677
// Get diagnostics before editing the file
656678
this.preDiagnostics = vscode.languages.getDiagnostics()
657679

658-
// Write the content directly to the file
680+
// Write the content directly to the file using Node's fs.
681+
// Node's fs.writeFile does NOT notify VSCode's file watcher, which is
682+
// intentional — it prevents open editor tabs from showing "unsaved changes"
683+
// prompts when the user tries to close them after background editing.
659684
await createDirectoriesForFile(absolutePath)
660685
await fs.writeFile(absolutePath, content, "utf-8")
661686

687+
// Verify the content was written correctly to disk with exponential backoff retry
688+
const fileUri = vscode.Uri.file(absolutePath)
689+
const MAX_WRITE_RETRIES = 3
690+
let writeVerified = false
691+
for (let attempt = 0; attempt < MAX_WRITE_RETRIES; attempt++) {
692+
const verifyContent = await fs.readFile(absolutePath, "utf-8")
693+
if (verifyContent === content) {
694+
writeVerified = true
695+
break
696+
}
697+
if (attempt < MAX_WRITE_RETRIES - 1) {
698+
// Exponential backoff: 100ms, 200ms
699+
await new Promise((resolve) => setTimeout(resolve, Math.pow(2, attempt) * 100))
700+
await fs.writeFile(absolutePath, content, "utf-8")
701+
}
702+
}
703+
if (!writeVerified) {
704+
throw new Error(`Failed to save content to ${relPath} after ${MAX_WRITE_RETRIES} attempts`)
705+
}
706+
662707
// Open the document to ensure diagnostics are loaded
663-
// When openFile is false (PREVENT_FOCUS_DISRUPTION enabled), we only open in memory
708+
// When openFile is false (PREVENT_FOCUS_DISRUPTION enabled), we only open
709+
// in memory and immediately save to mark it as "clean" in VSCode — this
710+
// prevents the "unsaved changes" prompt when closing the tab.
664711
if (openFile) {
665-
// Show the document in the editor
666-
await vscode.window.showTextDocument(vscode.Uri.file(absolutePath), {
712+
// Show the document in the editor without stealing focus
713+
await vscode.window.showTextDocument(fileUri, {
667714
preview: false,
668715
preserveFocus: true,
669716
})
670717
} else {
671-
// Just open the document in memory to trigger diagnostics without showing it
672-
const doc = await vscode.workspace.openTextDocument(vscode.Uri.file(absolutePath))
718+
// Open the document in memory to trigger diagnostics without showing it
719+
const doc = await vscode.workspace.openTextDocument(fileUri)
673720

674-
// Save the document to ensure VSCode recognizes it as saved and triggers diagnostics
721+
// Save the document to ensure VSCode recognizes it as saved and
722+
// triggers diagnostics. Without this, VSCode would show "unsaved
723+
// changes" when the user tries to close the file.
675724
if (doc.isDirty) {
676725
await doc.save()
677726
}
678727

679-
// Force a small delay to ensure diagnostics are triggered
728+
// Small delay to allow diagnostics to be triggered
680729
await new Promise((resolve) => setTimeout(resolve, 100))
681730
}
682731

@@ -712,15 +761,35 @@ export class DiffViewProvider {
712761
newProblems.length > 0 ? `\n\nNew problems detected after saving the file:\n${newProblems}` : ""
713762
}
714763

764+
// Read back the final content to detect any user modifications
765+
// that may have occurred via external editors or file watchers
766+
let detectedUserEdits: string | undefined
767+
try {
768+
const finalDoc = await vscode.workspace.openTextDocument(vscode.Uri.file(absolutePath))
769+
const finalDocContent = finalDoc.getText()
770+
const normalizedExpected = content.replace(/\r\n|\n/g, "\n")
771+
const normalizedActual = finalDocContent.replace(/\r\n|\n/g, "\n")
772+
773+
if (normalizedActual !== normalizedExpected) {
774+
detectedUserEdits = formatResponse.createPrettyPatch(
775+
relPath.toPosix(),
776+
normalizedExpected,
777+
normalizedActual,
778+
)
779+
}
780+
} catch {
781+
// If we can't read back the document, proceed without user edit detection
782+
}
783+
715784
// Store the results for formatFileWriteResponse
716785
this.newProblemsMessage = newProblemsMessage
717-
this.userEdits = undefined
786+
this.userEdits = detectedUserEdits
718787
this.relPath = relPath
719788
this.newContent = content
720789

721790
return {
722791
newProblemsMessage,
723-
userEdits: undefined,
792+
userEdits: detectedUserEdits,
724793
finalContent: content,
725794
}
726795
}

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