fix(cef): import gtk prelude for Linux dialog (TAURI-RUST-F)

[oxoxDev]

Summary

Two compile fixes for breakage introduced by #17's merged code (commit 8ea806e): a Linux-only gtk trait-import error and a macOS-only unsafe-call error. Both live in crates/tauri-runtime-cef/src/cef_init_guard.rs.

Problem

#17 added a graceful CEF-init failure dialog with per-platform native implementations. Two of those paths fail to compile:

Linux — the gtk_impl path calls dialog.set_title(...) and dialog.run() on a gtk::MessageDialog, but the module never brings the gtk extension traits into scope. set_title is GtkWindowExt::set_title and run is DialogExt::run — without those traits in scope the Linux target fails:

error[E0599]: no method named `set_title` found for struct `MessageDialog`
error[E0599]: no method named `run` found for struct `MessageDialog`

It was caught by the downstream cargo-llvm-cov Linux coverage job.

macOS — the macos path calls four objc2 NSAlert methods (NSAlert::new, setMessageText, setInformativeText, runModal) that are marked unsafe in objc2-app-kit, but invokes them outside any unsafe {} block, so cargo check -p tauri-runtime-cef fails on macOS:

error[E0133]: call to unsafe function `NSAlert::new` is unsafe and requires unsafe block
error[E0133]: call to unsafe function `setMessageText` is unsafe and requires unsafe block
error[E0133]: call to unsafe function `setInformativeText` is unsafe and requires unsafe block
error[E0133]: call to unsafe function `runModal` is unsafe and requires unsafe block

Both breaks are pre-existing in #17, not introduced by this PR — this PR fixes them.

Solution

• Linux: add use gtk::prelude::{DialogExt, GtkWindowExt}; inside the gtk_impl module — the two traits that provide run and set_title.
• macOS: wrap the four consecutive NSAlert calls in a single enclosing unsafe {} block with a // SAFETY: note (fresh receiver, valid strings, main thread guaranteed by the MainThreadMarker). No suppression attributes.

Surgical, single-file changes; no behavior change on any platform.

Impact

• Linux target compiles again (gtk trait imports).
• macOS target compiles again (cargo check -p tauri-runtime-cef passes clean; four E0133 gone, no new warnings).
• Windows unaffected (separate Win32 dialog impl, untouched).

Related

• Fixes the Linux compile regression from fix(tauri-runtime-cef): exit cleanly instead of panic when cef::initialize fails (TAURI-RUST-F) #17.
• Fixes the macOS unsafe-call (E0133) regression from fix(tauri-runtime-cef): exit cleanly instead of panic when cef::initialize fails (TAURI-RUST-F) #17.
• The consuming openhuman PR (feat: add shutters tauri-apps/tauri#3337) will re-bump its tauri-cef submodule pin to this commit once merged.

Summary by CodeRabbit

• Chores
  • Improved macOS native alert handling by clarifying safety boundaries around system UI calls.
  • Restored Linux/BSD build compatibility by ensuring necessary GTK dialog methods are available, fixing related compilation issues.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 40c105bb-94e9-4e2e-b6b0-6879069f1858

📥 Commits

Reviewing files that changed from the base of the PR and between 74b0e65 and b66905b.

📒 Files selected for processing (1)

• crates/tauri-runtime-cef/src/cef_init_guard.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• crates/tauri-runtime-cef/src/cef_init_guard.rs

---

📝 Walkthrough

Walkthrough

Wraps macOS NSAlert usage in an explicit unsafe block with updated safety comments; and imports gtk::prelude::{DialogExt, GtkWindowExt} in the Linux/BSD gtk_impl module so set_title and run are available.

Changes

Platform-specific UI fixes

Layer / File(s)	Summary
macOS NSAlert safety crates/tauri-runtime-cef/src/cef_init_guard.rs	Moves NSAlert construction and setMessageText/setInformativeText/runModal calls into an explicit unsafe block and updates safety comments about receiver/lifetime and main-thread requirement.
Linux/BSD GTK prelude imports crates/tauri-runtime-cef/src/cef_init_guard.rs	Adds gtk::prelude::{DialogExt, GtkWindowExt} in the gtk_impl conditional to bring set_title and run extension methods into scope for the dialog.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A tiny hop, a careful sight,
Unsafe wrapped the macOS light,
GTK traits find their place,
Dialogs run with gentle grace,
Builds proceed — a quiet delight.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a gtk prelude import to fix Linux compilation errors in the CEF dialog implementation.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}