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feat(main): improve Electron window persistence and diagnostics - #983
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…rocess error codes With Electron 44 now the runtime (PR #963), use what it provides natively instead of leaving these gaps: the main window persists size, position, maximized and fullscreen state across launches via name flo-main and windowStatePersistence, rather than always opening at the hardcoded 1400x900. child-process-gone now records details.systemErrorCode in the log and crash telemetry, so launch failures (ENOENT, permission errors, Windows error codes) are diagnosable instead of a bare non-zero exit. recoverFailedWindow destroys the failed window before recreating it, so the unique window name and GPU resources are released first. createMainWindow keeps accepting a trailing TitleBarMode string for existing call sites and now also accepts an options override object. The sleep/wake 1px repaint nudge is kept as defense-in-depth, and title-bar mode behavior is unchanged.
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WalkthroughThe changes update main-window option resolution, failed-window recovery order, and child-process error logs and telemetry. Documentation and tests also describe or check main-window persistence and options. ChangesDesktop runtime updates
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Merge Risk: 🔵 Low · up to The new options API can create a window without renderer IPC when callers customize web preferences. The current production window is unaffected, so this is a bounded risk to address before relying on that override. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 4 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @main/window-options.ts:
- Line 85: Update the BrowserWindow options merge in createMainWindow so
resolvedOptions cannot replace the generated webPreferences object. Separate
webPreferences overrides from the remaining window options, merge the overrides
while retaining the generated preload and isolation settings, and spread only
the remaining options into the constructor.
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📒 Files selected for processing (5)
docs/architecture/desktop-build.mdmain/index.tsmain/window-options.tstests/platform-titlebar-runtime-probe.cjstests/titlebar-window-options.test.ts
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…ow-and-telemetry-improvements
createMainWindow spread the caller options over the generated window options, so an options object carrying webPreferences replaced the generated object and silently dropped the preload along with contextIsolation, nodeIntegration and sandbox. Overriding a single preference would have left the renderer without window.electronAPI. webPreferences is now destructured out of the overrides and merged ahead of the enforced preload and isolation settings, while the remaining options spread as before. Regression assertions cover both the merged preference and a non-webPreferences override.
1 participant
Intent
Follow-up to the merged Electron 43.7.7 -> 44.5.1 bump (PR #963). Adopt the Electron 44 capabilities that replace work FloCafe was doing by hand, keeping the change surgical: (1) enable native window state persistence on the main window (name 'flo-main' plus windowStatePersistence: true) so size, position, maximized and fullscreen state survive restarts instead of always opening at the hardcoded 1400x900; (2) capture the new details.systemErrorCode on app 'child-process-gone' in both the log line and the child_process_gone telemetry event, so child-process launch failures such as ENOENT, permission errors and Windows error codes are diagnosable rather than a bare non-zero exit code; (3) destroy the failed window before recreating it in recoverFailedWindow so the unique window name and GPU resources are released before the replacement is created. Constraints and deliberate decisions: createMainWindow must keep accepting a trailing TitleBarMode string for existing call sites while also accepting an options override object; the sleep/wake 1px repaint nudge stays as defense-in-depth even though Chromium 152 improves compositor recovery; title-bar mode behavior is unchanged. The platform titlebar runtime probe observer window gets a distinct name so it does not collide with the flo-main window. Changes are limited to main/index.ts, main/window-options.ts, tests/titlebar-window-options.test.ts and tests/platform-titlebar-runtime-probe.cjs. Validate with the no-mistakes pipeline, push the branch and open the PR.
What Changed
flo-mainwindow, retaining its default size and supporting window option overrides alongside title-bar modes.systemErrorCodein logs and telemetry, and destroy a failed window before recreating it.Risk Assessment
✅ Low: The change is narrowly scoped, preserves existing title-bar call patterns, and configures Electron window-state persistence with a unique window name as documented by Electron.
Testing
Built and launched Flo with Electron 44.5.1 using isolated native E2E profiles. Maximized geometry and fullscreen state survived restarts; child-process logs and captured telemetry included systemErrorCode=2; retry exhaustion replaced the window only after destroying the old one; and resume retained the 1px repaint nudge. The first temporary telemetry driver needed a Playwright evaluator access adjustment, and a failed-navigation attempt did not reach the recovery branch; both drivers were corrected and the focused scenarios passed. Screenshots and runtime logs are attached. Generated build and test files were removed; only workspace-local dependencies remain.
test:titlebar-window-optionsEvidence: Electron 44.5.1 title-bar runtime probe
Evidence: Live window persistence and resume checks
Evidence: Live child-process diagnostics and failed-window recovery checks
Pipeline
Updates from git push no-mistakes
✅ **intent** - passed
✅ No issues found.
✅ **Rebase** - passed
✅ No issues found.
✅ **Review** - passed
✅ No issues found.
✅ **Test** - passed
✅ No issues found.
test:titlebar-window-optionsnpm cinpm run buildnpm run build:frontendnpm run test:titlebar-window-optionsnode_modules/.bin/electron tests/platform-titlebar-runtime-probe.cjsplaywright test --config=playwright.electron.config.ts --project=electron-desktop e2e/desktop/live-electron-change.electron.spec.ts --grep 'child process failure|retry exhaustion' --reporter=lineplaywright test --config=playwright.electron.config.ts --project=electron-desktop e2e/desktop/live-electron-change.electron.spec.ts --grep 'restores its size|restores fullscreen|resume event' --reporter=linegit diff --checkand finalgit status --short✅ **Document** - passed
✅ No issues found.
✅ **Lint** - passed
✅ No issues found.
✅ **Push** - passed
✅ No issues found.
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