fix: Increase workbench border radius on macos tahoe

[avarayr]

fixes: #270188

⚠️ important notes:

Electron will (sometime in the near future) bump their build workflow to build on MacOS 26 Tahoe, which uses XCode 26.
Apps built with XCode 26 will have even bigger corner radius, here's an example

electron preparing for xcode26 is tracked here: electron/electron#47514

So this will be revisited in the future to increase even more (possibly to 18px?)

[Copilot]

Pull Request Overview

This PR updates VS Code's macOS styling to handle the increased border radius introduced in macOS Tahoe (version 25+). It adds detection for macOS Tahoe and applies 12px border radius instead of the 10px used for Big Sur and later versions.

Key changes:

• Added isTahoeOrNewer function to detect macOS Tahoe (version 25+)
• Updated workbench class detection to apply macos-tahoe-or-newer CSS class
• Applied 12px border radius styling for Tahoe across workbench, statusbar, and process explorer components

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/vs/base/common/platform.ts	Added isTahoeOrNewer function to detect macOS version 25+
src/vs/workbench/electron-browser/desktop.main.ts	Updated class detection logic to apply macos-tahoe-or-newer class for Tahoe
src/vs/workbench/browser/media/style.css	Added 12px border radius for main workbench on Tahoe
src/vs/workbench/browser/parts/statusbar/media/statusbarpart.css	Added 12px border radius for statusbar on Tahoe
src/vs/workbench/contrib/processExplorer/browser/media/processExplorer.css	Added 12px border radius for process explorer on Tahoe

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@bpasero

Matched files:

• src/vs/workbench/browser/media/style.css
• src/vs/workbench/browser/parts/statusbar/media/statusbarpart.css
• src/vs/workbench/electron-browser/desktop.main.ts

[deepak1556]

Thanks for linking the upstream issue, the table in their is slightly incorrect

VSCode based on Chromium 138 is built with 15.4 SDK (Electron 37)
Chromium 140-142 are built with 15.5 SDK (Electron 38 and 39)
Chromium >143 are built with 26.0 SDK (will be in Electron 40)

Unsure if there are corner radii changes between 15.4 and 15.5, but we can revisit the values over every Electron update till v40.

[deepak1556]

LGTM, Thank you!

[Tyriar]

@deepak1556 this class name isn't the best anymore as it won't be present when the version is tahoe, despite tahoe being bigsur or newer.

[avarayr]

I propose removing the -or-newer suffix and opting for macos-rounded-bigsur, macos-rounded-tahoe that sort of resembles tailwind-esque classes. But I'm not sure how worth it is.

Plus having macos-rounded-bigsur sounds fine even when running on Sequoia, because sequoia inherits bigsur border radius so it checks out

[deepak1556]

Good catch! I think we can rewrite the logic to match the version table we currently support on macOS

if (isMacintosh) {
  if (isTahoeOrNewer(this.configuration.os.release)) {
       return ['macos-rounded-tahoe'];
  } else {
       return ['macos-rounded-default'];
  }