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Preserve BOM in web editor (#28935) #28959

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Jan 27, 2024

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Backport #28935 by @silverwind

The ToUTF8* functions were stripping BOM, while BOM is actually valid in UTF8, so the stripping must be optional depending on use case. This does:

  • Add a options struct to all ToUTF8* functions, that by default will strip BOM to preserve existing behaviour
  • Remove ToUTF8 function, it was dead code
  • Rename ToUTF8WithErr to ToUTF8
  • Preserve BOM in Monaco Editor
  • Remove a unnecessary newline in the textarea value. Browsers did ignore it, it seems but it's better not to rely on this behaviour.

Fixes: #28743
Related: #6716 which seems to have once introduced a mechanism that strips and re-adds the BOM, but from what I can tell, this mechanism was removed at some point after that PR.

The `ToUTF8*` functions were stripping BOM, while BOM is actually valid
in UTF8, so the stripping must be optional depending on use case. This
does:

- Add a options struct to all `ToUTF8*` functions, that by default will
strip BOM to preserve existing behaviour
- Remove `ToUTF8` function, it was dead code
- Rename `ToUTF8WithErr` to `ToUTF8`
- Preserve BOM in Monaco Editor
- Remove a unnecessary newline in the textarea value. Browsers did
ignore it, it seems but it's better not to rely on this behaviour.

Fixes: go-gitea#28743
Related: go-gitea#6716 which seems to
have once introduced a mechanism that strips and re-adds the BOM, but
from what I can tell, this mechanism was removed at some point after
that PR.
@GiteaBot GiteaBot added the lgtm/need 2 This PR needs two approvals by maintainers to be considered for merging. label Jan 27, 2024
@GiteaBot GiteaBot added this to the 1.21.5 milestone Jan 27, 2024
@pull-request-size pull-request-size bot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Jan 27, 2024
@GiteaBot GiteaBot added lgtm/need 1 This PR needs approval from one additional maintainer to be merged. and removed lgtm/need 2 This PR needs two approvals by maintainers to be considered for merging. labels Jan 27, 2024
@GiteaBot GiteaBot added lgtm/done This PR has enough approvals to get merged. There are no important open reservations anymore. and removed lgtm/need 1 This PR needs approval from one additional maintainer to be merged. labels Jan 27, 2024
@silverwind silverwind added the reviewed/wait-merge This pull request is part of the merge queue. It will be merged soon. label Jan 27, 2024
@silverwind silverwind merged commit b8e6cff into go-gitea:release/v1.21 Jan 27, 2024
26 checks passed
@GiteaBot GiteaBot removed the reviewed/wait-merge This pull request is part of the merge queue. It will be merged soon. label Jan 27, 2024
nrdufour added a commit to nrdufour/home-ops that referenced this pull request Feb 4, 2024
This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [docker.io/gitea/gitea](https://github.com/go-gitea/gitea) | patch | `1.21.4` -> `1.21.5` |

---

### Release Notes

<details>
<summary>go-gitea/gitea (docker.io/gitea/gitea)</summary>

### [`v1.21.5`](https://github.com/go-gitea/gitea/releases/tag/v1.21.5)

[Compare Source](go-gitea/gitea@v1.21.4...v1.21.5)

-   SECURITY
    -   Prevent anonymous container access if `RequireSignInView` is enabled ([#&#8203;28877](go-gitea/gitea#28877)) ([#&#8203;28882](go-gitea/gitea#28882))
    -   Update go dependencies and fix go-git ([#&#8203;28893](go-gitea/gitea#28893)) ([#&#8203;28934](go-gitea/gitea#28934))
-   BUGFIXES
    -   Revert "Speed up loading the dashboard on mysql/mariadb ([#&#8203;28546](go-gitea/gitea#28546))" ([#&#8203;29006](go-gitea/gitea#29006)) ([#&#8203;29007](go-gitea/gitea#29007))
    -   Fix an actions schedule bug ([#&#8203;28942](go-gitea/gitea#28942)) ([#&#8203;28999](go-gitea/gitea#28999))
    -   Fix update enable_prune even if mirror_interval is not provided ([#&#8203;28905](go-gitea/gitea#28905)) ([#&#8203;28929](go-gitea/gitea#28929))
    -   Fix uploaded artifacts should be overwritten ([#&#8203;28726](go-gitea/gitea#28726)) backport v1.21 ([#&#8203;28832](go-gitea/gitea#28832))
    -   Preserve BOM in web editor ([#&#8203;28935](go-gitea/gitea#28935)) ([#&#8203;28959](go-gitea/gitea#28959))
    -   Strip `/` from relative links ([#&#8203;28932](go-gitea/gitea#28932)) ([#&#8203;28952](go-gitea/gitea#28952))
    -   Don't remove all mirror repository's releases when mirroring ([#&#8203;28817](go-gitea/gitea#28817)) ([#&#8203;28939](go-gitea/gitea#28939))
    -   Implement `MigrateRepository` for the actions notifier ([#&#8203;28920](go-gitea/gitea#28920)) ([#&#8203;28923](go-gitea/gitea#28923))
    -   Respect branch info for relative links ([#&#8203;28909](go-gitea/gitea#28909)) ([#&#8203;28922](go-gitea/gitea#28922))
    -   Don't reload timeline page when (un)resolving or replying conversation ([#&#8203;28654](go-gitea/gitea#28654)) ([#&#8203;28917](go-gitea/gitea#28917))
    -   Only migrate the first 255 chars of a Github issue title ([#&#8203;28902](go-gitea/gitea#28902)) ([#&#8203;28912](go-gitea/gitea#28912))
    -   Fix sort bug on repository issues list ([#&#8203;28897](go-gitea/gitea#28897)) ([#&#8203;28901](go-gitea/gitea#28901))
    -   Fix `DeleteCollaboration` transaction behaviour ([#&#8203;28886](go-gitea/gitea#28886)) ([#&#8203;28889](go-gitea/gitea#28889))
    -   Fix schedule not trigger bug because matching full ref name with short ref name ([#&#8203;28874](go-gitea/gitea#28874)) ([#&#8203;28888](go-gitea/gitea#28888))
    -   Fix migrate storage bug ([#&#8203;28830](go-gitea/gitea#28830)) ([#&#8203;28867](go-gitea/gitea#28867))
    -   Fix archive creating LFS hooks and breaking pull requests ([#&#8203;28848](go-gitea/gitea#28848)) ([#&#8203;28851](go-gitea/gitea#28851))
    -   Fix reverting a merge commit failing ([#&#8203;28794](go-gitea/gitea#28794)) ([#&#8203;28825](go-gitea/gitea#28825))
    -   Upgrade xorm to v1.3.7 to fix a resource leak problem caused by Iterate ([#&#8203;28891](go-gitea/gitea#28891)) ([#&#8203;28895](go-gitea/gitea#28895))
    -   Fix incorrect PostgreSQL connection string for Unix sockets ([#&#8203;28865](go-gitea/gitea#28865)) ([#&#8203;28870](go-gitea/gitea#28870))
-   ENHANCEMENTS
    -   Make loading animation less aggressive ([#&#8203;28955](go-gitea/gitea#28955)) ([#&#8203;28956](go-gitea/gitea#28956))
    -   Avoid duplicate JS error messages on UI ([#&#8203;28873](go-gitea/gitea#28873)) ([#&#8203;28881](go-gitea/gitea#28881))
    -   Bump `@github/relative-time-element` to 4.3.1 ([#&#8203;28819](go-gitea/gitea#28819)) ([#&#8203;28826](go-gitea/gitea#28826))
-   MISC
    -   Warn that `DISABLE_QUERY_AUTH_TOKEN` is false only if it's explicitly defined ([#&#8203;28783](go-gitea/gitea#28783)) ([#&#8203;28868](go-gitea/gitea#28868))
    -   Remove duplicated checkinit on git module ([#&#8203;28824](go-gitea/gitea#28824)) ([#&#8203;28831](go-gitea/gitea#28831))

Instances on **[Gitea Cloud](https://cloud.gitea.com)** will be automatically upgraded to this version during the specified maintenance window.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xNjUuMCIsInVwZGF0ZWRJblZlciI6IjM3LjE2NS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Reviewed-on: https://git.home/nrdufour/home-ops/pulls/355
Co-authored-by: Renovate <renovate@ptinem.io>
Co-committed-by: Renovate <renovate@ptinem.io>
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