[techmore]

Rebases and completes #555 on current dev, and unifies the corner radius.

What was wrong

The session used three different radii: a 20 px display mask (dev's provisional screen_corners.rs), a window clip that had been 12 and was hand-changed to 20 on 2026-10-22, a 20 px GTK theme, and SDK tokens saying 14/12. Windows were not clipped by the Rust compositor at all.

Changes

• Compositor: rounded corners (screen mask, window clip shader, hug-the-display) #555: token-driven screen mask, window clip shader (continuous/superellipse), hug-the-display rule (display-corner contact uses screen, other screen-edge contact square, free corners window, popups popover, panels/dock rounded away from edges, external outputs all square)
• removed dev's provisional screen_corners.rs; its PANTHEON_SCREEN_CORNER_RADIUS override (0-128, 0 = off) is kept and now drives the same token
• tokens screen and window 14/12 -> 20, the value you had already set by hand (SDK-CORNERS.md and BUG-FIX-ROADMAP updated)
• build fix: CornerRenderer bound on the new screenshot path (dev code that postdates Compositor: rounded corners (screen mask, window clip shader, hug-the-display) #555); moved a test module so clippy passes

Checked

cargo fmt; clippy -D warnings on default and native-drm; 165 compositor tests (new: override parsing); all msdk tests.

Not done

Not installed; the running session is untouched. No visual check on the built-in display and no app matrix (GTK, libadwaita, third-party, maximized/fullscreen, dialogs, popovers). 20 is a calibration starting point, not a measured panel radius. Supersedes #555.

[techmore]

Try-out package for the owner (not installed): the CI-built pantheon-rust-compositor deb from run 40499911528 (commit dba2830), a rollback copy of the currently installed files, and steps are in ~/mseries-tryout/ on the J314S. Note the package includes all compositor changes since the installed gitd28e997e (Oct 23), not just corners.

[techmore]

Note

🤖 Claude Opus 5.5 (Claude Code) responding on behalf of techmore

This PR accidentally commits 582 Cargo build files under rust/msdk/target/. That is why it shows 596 changed files. The real change is about 14 files: rust/pantheon-compositor/src, the corner tokens in rust/msdk/data, Cargo.lock and two docs.

To clean the branch before merging:

git rm -r --cached rust/msdk/target
git commit -m "Drop committed Cargo build output"

#628 changes .gitignore to ignore target/ everywhere, so this can't happen again.

[techmore]

Superseded by #641, which merged the same source changes (rebased on dev) without the ~580 rust/msdk/target build files that this branch committed by mistake (my error: SDK tests were run inside the worktree and git add -A picked up the output). Closing and deleting the branch so the artifacts don't linger. The compositor corners work, the 20 px token and the PANTHEON_SCREEN_CORNER_RADIUS override are all on dev via #641.