fix(web): diff file Open and Reveal reach a file whose name has a backslash by only21mil · Pull Request #23167 · pingdotgg/t3code

only21mil · 2026-10-21T23:57:51Z

Problem

On Linux and macOS a file name can contain a backslash. When a turn changes back\slash.txt and back/slash.txt, clicking the back\slash.txt title in the Diff panel, or choosing Open, Reveal in Files or Open with on it there or on its Changes card row, opens back/slash.txt instead. In a nested project without a remote, the same actions double the folder prefix and open a path that does not exist.

Change

Git writes / between folders on every platform, so a backslash in a changed-file path is part of a file name. resolveDiffPathForWorkspace in diffFileActions.ts now splits on / only instead of rewriting every \ to /; under a Windows root, where \ is a separator, it still splits on both. maria-rcks's commit a037368 resolves these actions against the Git status root, so a nested project without a remote no longer doubles its folder prefix.

Scope

Bug fix: wrong data (a file action opens a different file than the one clicked, or a path that does not exist). Refs #35017. #35075, now on main, fixed the Changes card tree and its row click for that report; this PR covers the file actions that still open the wrong path (the Diff panel title click, and right-click Open, Reveal and Open with there and on the card). There's no new setting, API or UI.

Verification

To see it on Linux web: 1. commit back\slash.txt and back/slash.txt in a Git repo added as a project; 2. in one turn, append a line to each; 3. open the diff and click the back\slash.txt title, or right-click it and choose Open.

Linux web in T3's Browser panel, sandboxed "Test machine" servers, Replay (dev), the scripted dev provider. Stand-in xdg-open, gdbus and code scripts only record the path T3 passes; a stand-in xdg-mime and a DISPLAY value make the server offer Reveal and the editors. Main b2e86d7902 (with #35075) first, then this head 0ff92b4afd.

On `back\slash.txt`	main	this head
Diff panel: Open, Reveal, Open with	`back/slash.txt`	`back\slash.txt` (Reveal: `back%5Cslash.txt`)
Diff panel: title click	`BASE_NESTED` opens	`BASE_LITERAL` opens
Changes card: right-click Open, Reveal	`back/slash.txt`	`back\slash.txt`
Nested project without a remote: Open	`project/project/a.ts`	`project/a.ts`

Clicking the back\slash.txt title on main b2e86d7: back/slash.txt opens

$Clicking the back\slash.txt title on main b2e86d7902: back/slash.txt opens$

Clicking the back\slash.txt title on this head 0ff92b4: back\slash.txt opens

$Clicking the back\slash.txt title on this head 0ff92b4afd: back\slash.txt opens$

Not checked:

A Windows host: Git paths use / there too, and the Windows rows are unit-tested, but I didn't run the app on Windows.
The desktop (Electron) build. It renders the same web component.
A real file manager or editor: the stand-ins record the argument T3 passes and open nothing.
A real agent turn on this head: the turns were Replay (dev) runs, and the changes came from a script.

Recorded paths, tests and the nested-project captures

Stand-in log, main b2e86d7902 (Open, Reveal in Files, Open with VS Code, then Open in the nested project; each argument is printed with bash printf %q, so one backslash shows as \\):

10:56:07 xdg-open /mnt/sample-paths/back/slash.txt
10:56:10 gdbus call --session --dest org.freedesktop.FileManager1 --object-path /org/freedesktop/FileManager1 --method org.freedesktop.FileManager1.ShowItems \[\"file:///mnt/sample-paths/back/slash.txt\"\] ''
10:56:13 code /mnt/sample-paths/back/slash.txt
10:58:20 xdg-open /mnt/sample-paths/project/project/a.ts

Stand-in log, this head 0ff92b4afd:

11:20:09 xdg-open /mnt/sample-paths/back\\slash.txt
11:20:11 gdbus call --session --dest org.freedesktop.FileManager1 --object-path /org/freedesktop/FileManager1 --method org.freedesktop.FileManager1.ShowItems \[\"file:///mnt/sample-paths/back%5Cslash.txt\"\] ''
11:20:14 code /mnt/sample-paths/back\\slash.txt
11:21:18 xdg-open /mnt/sample-paths/project/a.ts

Changes card, right-click on the back\slash.txt row, then Open and Reveal in Files. Stand-in log, main b2e86d7902:

11:37:12 xdg-open /mnt/sample-paths/back/slash.txt
11:37:15 gdbus call --session --dest org.freedesktop.FileManager1 --object-path /org/freedesktop/FileManager1 --method org.freedesktop.FileManager1.ShowItems \[\"file:///mnt/sample-paths/back/slash.txt\"\] ''

Stand-in log, this head 0ff92b4afd:

11:38:18 xdg-open /mnt/sample-paths/back\\slash.txt
11:38:20 gdbus call --session --dest org.freedesktop.FileManager1 --object-path /org/freedesktop/FileManager1 --method org.freedesktop.FileManager1.ShowItems \[\"file:///mnt/sample-paths/back%5Cslash.txt\"\] ''

Changes card right-click menu on the back\slash.txt row, this head 0ff92b4

$Changes card right-click menu on the back\slash.txt row, this head 0ff92b4afd$

Nested project, title click on main b2e86d7: the doubled path cannot be read

Nested project, title click on this head 0ff92b4: a.ts opens

Tests, Node 26.12.1:

cd apps/web && vp test run --project unit src/diffFileActions.test.ts with this head's test file on main b2e86d7902: 1 failed, 20 passed (only the back\slash.txt row: expected 'back/slash.txt' to be 'back\slash.txt'); it passes here.
On this head, diffFileActions.test.ts, DiffPanel.browser.test.tsx and turnDiffTree.test.ts: 31 passed. vp run typecheck in apps/web and vp run check:changed b2e86d7902 pass.
diffFileActions.test.ts holds one table of resolver cases (Windows roots, including Frontend/src\index.ts and Frontend\src\index.ts in C:\repo\frontend, which resolve to src/index.ts on main and here; back\slash.txt; a /repo/back\slash workspace whose back\slash/a.ts resolves to a.ts) and a ..\ row in the out-of-project table; DiffPanel.browser.test.tsx covers the nested project (a037368, in DiffPanel.tsx and TimelineAssistantRows.tsx).
A workspace path is split on its root's own separator, and .. is still refused on either separator.
The paths come from git diff --numstat -z; joinPath still turns / into \ for Windows roots, so the host conversion stays at that one boundary.
Earlier: the literal-backslash case failed on ba01d33 (back/slash.txt), the /repo/back\slash workspace case failed on ecee07d (null), and with a1a2d3c 13 passed.

maria-rcks verified head a0373688ab in a real dev environment on Linux, web client, with real Codex turns: right-click Open and Reveal send the exact path, and the nested project opens a.ts (report).

Generated with Claude Opus 5.5 in T3 Code Nightly

Checkpoint paths come from Git numstat, which separates directories with "/" on every platform. The changed-files tree also split on "\", so a POSIX file named back\slash.txt showed under a false "back" folder and shared the identity of back/slash.txt, opening the wrong diff. Split only on "/" and keep the card's folder check in line. Co-Authored-By: Claude Opus 5.5 <[email protected]>

macroscopeapp · 2026-10-21T23:59:44Z

Approvability

Verdict: Approved at 2428087

Macroscope's review found this PR approvable — This is a narrowly scoped web bug fix that preserves literal backslashes in changed-file names while retaining normal directory handling. The implementation is small, isolated, and covered by a regression test.

^{You can add or adjust custom eligibility rules. Learn more.}

coderabbitai · 2026-10-22T00:01:42Z

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Walkthrough

Path handling now uses / as the Git path separator. Backslashes remain part of filenames. File action resolution selects a separator based on the repository root and rejects parent-directory segments split by either slash style.

Changes: Git path handling

Layer / File(s)	Summary
Treat backslashes as filename characters `apps/web/src/lib/turnDiffTree.ts`, `apps/web/src/diffFileActions.ts`, `apps/web/src/components/chat/ChangedFilesTree.tsx`, `apps/web/src/lib/turnDiffTree.test.ts`, `apps/web/src/diffFileActions.test.ts`	Path normalization and directory detection recognize only `/` as a separator. File action resolution selects a separator based on whether the repository root is a Windows absolute path and rejects parent-directory segments split by either slash style. Tests cover these cases.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Possibly related PRs

pingdotgg/t3code#30158: This PR changes handling of backslashes in the same tree utility.
pingdotgg/t3code#22844: This PR also tests preserving literal backslashes in Git paths.

Suggested labels: bugfix

Suggested reviewers: juliusmarminge, gb1095

Merge Risk: Minimal · up to 59e4b

The inspected paths preserve distinct filenames; no merge-blocking risk was established.

Pre-merge checks: 4

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title names the main change: file Open and Reveal actions in the diff panel now resolve a file whose name contains a backslash to the correct path. It follows the conventional commit form and matc…
Description check		The description follows the template. It has Problem, Change, Scope, and Verification sections, and it states the reproduction steps, the expected behavior, the linked issue (Refs `#35017`), and the bef…

Full details: Title check

Explanation

The title names the main change: file Open and Reveal actions in the diff panel now resolve a file whose name contains a backslash to the correct path. It follows the conventional commit form and matches the changeset, which splits Git paths on '/' only and resolves workspace paths by root separator.

Full details: Description check

Explanation

The description follows the template. It has Problem, Change, Scope, and Verification sections, and it states the reproduction steps, the expected behavior, the linked issue (Refs #35017), and the before/after screenshots and test results. It also lists what was not checked. The Change section names the function and the separator logic, and the template's agent-model footer is present.

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Review comments at @apps/web/src/lib/turnDiffTree.ts:
- Line 38: Update resolveDiffPathForWorkspace to preserve Git’s slash-separated
paths without converting backslashes into separators; convert the logical path
to a host path only at the filesystem boundary so filenames containing literal
backslashes resolve correctly. Update the existing mixed-separator test and add
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maria-rcks · 2026-11-01T01:38:08Z

Note

Written by gpt-6.1-sol on behalf of Maria

Verified in a real dev environment

verified on linux with repository playwright, /usr/bin/google-chrome, and real codex gpt-6.1-sol turns through the web composer. projects, threads, baseline commits, and file changes were created through the app and provider. no mocks or demo data.

reproduced on fetched github/main (4c924ff4e6): back\slash.txt and back/slash.txt appeared as two slash.txt rows under back. clicking the literal file's +1 row opened the nested file's +2 diff. clicking the literal diff header also opened BASE_NESTED.
stopped main before starting the pr. copied this task's isolated app-created state for matching captures. on the pr, the literal file has its own row and opens the correct diff and BASE_LITERAL content.
fresh pr-side codex turns verified a literal-only change, no false folder control, ordinary nested and top-level file selection, and collapse/expand-all. right-click open sent the exact literal path; reveal selected that file in linux files.
found and fixed another reachable case in a0373688ab: a nested project without a remote had no repository identity, so opening nested\workspace/a.ts duplicated its directory prefix. diff clicks and changes-card open/reveal now use the actual git status root. the existing browser test failed before the fix and passed afterward.
reinstalled dependencies, restarted the isolated dev server, ran another real codex turn in the nested project, and opened its changed file successfully. both context-menu actions sent the correct nested path.
final-head blacksmith vp run check:changed passed format, lint, knip, affected typechecks, 29 tests across three existing files, and react compiler checks. github ci passed after rerunning a runner-library installation timeout. no rebase, force-push, merge, or label changes.

main, after clicking the literal file's +1 row:

pr, matching data and click:

nested project before the additional fix:

same nested project and file contents after the fix:

literal, nested, and plain-file interactions, followed by folder controls. loading gaps were trimmed; playback speed is unchanged. inspected the clip and verified uploaded playback and seeking in chrome and t3's preview:

runtime command transcript

Not verified

native electron, ios/android, windows/macOS hosts, remote relay/tunnel connections, and other providers were not exercised on this linux vm. the existing file-viewer tab and breadcrumb labels still split literal backslashes; file contents and resolved paths are correct. that label issue is unchanged.

The changed-files tree now keeps back\slash.txt apart from back/slash.txt, but resolveDiffPathForWorkspace still turned every backslash into "/", so Open, the context-menu Open and Reveal landed on back/slash.txt. Split Git paths on "/" only and leave the host separator to the path join. Co-Authored-By: Claude Opus 5.5 <[email protected]>

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Inline comments:
Review comments at @apps/web/src/diffFileActions.ts:
- Line 23: Update the path segmentation used by
repositoryRelativeWorkspaceSegments so POSIX workspace roots split only on `/`
and backslashes within Git-reported path segments remain intact, while
preserving existing Windows-root handling. Add coverage for a nested POSIX
workspace containing a backslash, such as `/repo/back\slash`, and verify its
Git-reported file path matches for both file actions.

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A POSIX workspace such as /repo/back\slash was split on "\" too, so its segments never matched Git's back\slash/a.ts and Open did nothing. Split the workspace suffix on the repository root's own separator: "\" for Windows roots, "/" otherwise. Co-Authored-By: Claude Opus 5.5 <[email protected]>

# Conflicts: # apps/web/src/diffFileActions.test.ts

…nged- Co-Authored-By: Claude Opus 5.5 <[email protected]>

The Changes card tree fix is on main with the same change and test. Co-Authored-By: Claude Opus 5.5 <[email protected]>

It only decides whether the expand-all control shows, not which file opens. Co-Authored-By: Claude Opus 5.5 <[email protected]>

Tool-call patches can name files with backslash separators; only POSIX roots keep a backslash as part of a file name. Co-Authored-By: Claude Opus 5.5 <[email protected]>

only21mil · 2026-11-12T11:43:51Z

Note

🤖 Opus 5.5 replying on behalf of Victor.

I merged main, which now has #35075, to clear the conflict and cut this PR down to the file actions that still open the wrong file for a name with a backslash.

github-actions Bot added vouch:unvouched Author is not yet trusted in the VOUCHED list. size:XS 0-9 changed lines (additions + deletions). labels Oct 21, 2026

macroscopeapp Bot approved these changes Oct 21, 2026

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only21mil mentioned this pull request Oct 22, 2026

fix(server): list folders named with a backslash on Linux and macOS #23398

Merged

merge: bring current main into changed-file path fix

ba01d33

coderabbitai Bot reviewed Oct 31, 2026

View reviewed changes

Comment thread apps/web/src/lib/turnDiffTree.ts Resolved

github-actions Bot added size:S 10-29 changed lines (additions + deletions). and removed size:XS 0-9 changed lines (additions + deletions). labels Nov 8, 2026

coderabbitai Bot reviewed Nov 8, 2026

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Comment thread apps/web/src/diffFileActions.ts Resolved

only21mil and others added 2 commits November 8, 2026 10:47

Merge remote-tracking branch 'github/main' into pr-23167

59e4b3f

# Conflicts: # apps/web/src/diffFileActions.test.ts

coderabbitai Bot mentioned this pull request Nov 10, 2026

fix(web): preserve POSIX backslash paths and gate file actions on permission #19819

Closed

fix(web): resolve nested diff files without a remote

a037368

github-actions Bot added size:M 30-99 changed lines (additions + deletions). and removed size:S 10-29 changed lines (additions + deletions). labels Nov 10, 2026

only21mil mentioned this pull request Nov 12, 2026

[Bug]: A file name with a backslash shows under a folder that does not exist in the Changes card #35017

Closed

2 tasks done

juliusmarminge mentioned this pull request Nov 12, 2026

fix(web): file names with a backslash no longer split into folders in the Changes card #35075

Merged

only21mil and others added 4 commits November 12, 2026 10:50

Merge branch 'main' into r13/a028-preserve-literal-backslashes-in-cha…

e1768cc

…nged- Co-Authored-By: Claude Opus 5.5 <[email protected]>

revert(web): leave the Changes card tree as on main

22e0bf7

The Changes card tree fix is on main with the same change and test. Co-Authored-By: Claude Opus 5.5 <[email protected]>

revert(web): keep the Changes card's folder check as on main

68c83ba

It only decides whether the expand-all control shows, not which file opens. Co-Authored-By: Claude Opus 5.5 <[email protected]>

fix(web): diff paths under a Windows root still split on backslashes

0ff92b4

Tool-call patches can name files with backslash separators; only POSIX roots keep a backslash as part of a file name. Co-Authored-By: Claude Opus 5.5 <[email protected]>

only21mil changed the title ~~fix(web): preserve literal backslashes in changed-file paths~~ fix(web): diff file Open and Reveal reach a file whose name has a backslash Nov 12, 2026

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fix(web): diff file Open and Reveal reach a file whose name has a backslash - #23167

fix(web): diff file Open and Reveal reach a file whose name has a backslash#23167
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