[WIP] Fix incorrect sidebar icon in macOS Tahoe

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Bug]: macOS Tahoe sidebar icon</issue_title>
<issue_description>### ⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

Sidebar icon in macOS Tahoe is incorrect

Previous sidebar icon:

Steps to reproduce

1. Install Nextcloud client on macOS Tahoe
2. Sidebar icon is inconsistent with all other sidebar icons, and different from what it was in Sonoma previously

Expected behavior

Have a consistent sidebar icon

Which files are affected by this bug

N/A

Operating system

macOS

Which version of the operating system you are running.

Tahoe 26.0

Package

Official macOS 12+ universal pkg

Nextcloud Server version

Nextcloud Hub 10 (31.0.8)

Nextcloud Desktop Client version

3.17.2

Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.16.1 to 3.16.2)

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Additional info

No response</issue_description>

<agent_instructions>Our code creates a folder in a location chosen by the user. The created folder is expected to have a custom symbol, at least it used to have that. More specifically, when added to the favorites in the Finder sidebar. Now only an ordinary folder symbol appears in the Finder sidebar and the folder itself does not have a custom symbol either.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@i2h3 ~How…? 😅 We do not specify a custom symbol yet but have it on our roadmap (#8472). And I cannot reproduce this on macOS 26 Tahoe where I only see a plain default folder icon for the file provider domain in Finder. So a change in this regard is intended anyway but this appears to be a macOS behavior for now.~

@dannyrobertson Do you use the file provider extension (also known as "VFS") or the classic sync? Are you referring to the entry which shows up under "Favorites" (usual classic sync root folder) by default or "Locations" (where the file provider usually appears)?</comment_new>
<comment_new>@i2h3
@AndyXheli Unfortunately that is not relevant for this issue because how the file provider ("VFS") defines its symbol is a completely different and independent story from the classic sync folder.</comment_new>
<comment_new>@i2h3
I cannot reproduce this issue.

1. Downloaded classic files client 4.0.2 for macOS.
2. Freshly set up with an account to locally deployed Nextcloud Docker container. Note: classic synchronization, no file provider extension!
3. Standard folder symbol in the Finder sidebar on macOS Tahoe 26.1.

The only relevant log line I could find:

2025-11-28 12:59:54:978 [ info nextcloud.gui.wizard /Volumes/builds/35376/macos-35376/src/gui/owncloudsetupwizard.cpp:522 ]:	Setup local sync folder for new oC connection  "/Users/iva/Nextcloud"

Are @Rello, @mgallien and @nilsding aware of this issue? I am not familiar with the classic synchronization. Maybe Copilot has a guess.</comment_new>

• Fixes [Bug]: macOS Tahoe sidebar icon #8770

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