Rebuild auxiliary windows when their WebView2 process exits - #444
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📝 WalkthroughWalkthroughThe desktop shell now detects dead WebView2 instances, destroys their hidden windows, and allows normal open paths to rebuild the floatbar, flyout, and settings windows. ChangesWebView2 recovery
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: 🔵 Low · up to A failed native-window destruction can leave an unusable detached window available for reuse instead of rebuilding it. Propagate the error so recovery does not report success incorrectly. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@apps/desktop-tauri/src-tauri/src/webview_recovery.rs`:
- Line 67: Update reclaim_dead_window to return Result<bool, String> and
propagate WebviewWindow::destroy() failures by mapping the error to String
instead of discarding it. Add ? handling at each of the three existing
Result<(), String> open paths that call reclaim_dead_window, preserving the
current successful boolean behavior.
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📒 Files selected for processing (5)
apps/desktop-tauri/src-tauri/src/floatbar/window.rsapps/desktop-tauri/src-tauri/src/main.rsapps/desktop-tauri/src-tauri/src/shell/flyout_window.rsapps/desktop-tauri/src-tauri/src/shell/settings_window.rsapps/desktop-tauri/src-tauri/src/webview_recovery.rs
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Follow-up to btsouth#444 for btsouth#410. That change drops a dead flyout, Settings or FloatBar window the next time it is opened; this one covers the two gaps it left: the main window, and windows that are on screen when their browser process dies. Main window. Its open paths (tray menu, Ctrl+Shift+U, set_surface_mode) run on the main thread or in sync commands, where destroying and rebuilding a window inline would block the event loop that has to process Destroyed. shell/window_recovery.rs therefore probes main before every transition and, when it is dead, hands destroy + rebuild to a std::thread and abandons the attempt. The probe is pure Win32 on the native handle captured at build time, so it never waits on the event loop while SHELL_TRANSITION_SERIAL is held. The rebuild uses WebviewWindowBuilder::from_config over the tauri.conf.json entry, so the new window inherits "visible": false and every other declared property, resets the surface state to Hidden to match, then replays the pending request on the main thread via run_on_main_thread. Every path that can notice a dead main (the transition guards, hide-to-tray, ProcessFailed) merges its request into one pending replay, so whichever wins the race to start the rebuild, an open issued meanwhile is still honoured. The replay must not run on the rebuild thread: a transition holds SHELL_TRANSITION_SERIAL while it calls window getters, and a freshly built window receives a Focused(true)/Focused(false) pair whose handler takes the same lock on the main thread, which deadlocked the whole app on every rebuild of a visible main window. ProcessFailed. shell/webview_lifecycle.rs subscribes every window the app builds (main, flyout, Settings, FloatBar, and every rebuilt window) to CoreWebView2's ProcessFailed event through webview2-com, which wry already depends on. Every failure logs a warn with the kind and label. BrowserProcessExited leaves the control unusable and rebuilds the window; RenderProcessExited gets a new render process from WebView2 itself and only reloads the page; the helper-process kinds are log-only. The handler runs inside the COM callback on the UI thread, so it only reads is_visible and outer_position and dispatches: a window that was visible is rebuilt and shown again through its own first-build path (main replays the current surface at its old position, Settings reopens on its default tab at its remembered geometry, the flyout goes through the visible(false) then frontend-reveal handshake); a hidden window is torn down so its next open is a plain first build. main is always rebuilt, hidden, so the next tray click is instant. The FloatBar is torn down and re-applied from settings, since an enabled bar is never re-shown and would otherwise stay blank. Per-window in-flight flags keep the concurrent rebuilds a shared browser process exit causes from stacking, and clear themselves if a rebuild thread panics. webview_recovery gains destroy_and_release for the rebuild threads: Tauri releases a destroyed window's label only when the event loop processes Destroyed, after destroy() returned, and a rebuild issued before that fails with "a window with label already exists". The wait compares native handles, so an open that races the teardown and rebuilds the window first ends the wait instead of timing it out against the new window, and it is bounded in polls rather than wall-clock time because each poll can block behind another window's build on the main thread. The flyout opener waits for an in-flight teardown of its own window for the same reason. The flyout's Focused(false) handler now ignores a never-shown window. Windows reports a focus loss when a hidden window is activated without foreground rights, which happens right after build; treating it as a dismiss cleared the pending reveal and left the rebuilt flyout invisible. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ykxBKGpjDqrWQj7JQVRNm
diogochaves
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Follow-up to btsouth#444 for btsouth#410. That change drops a dead flyout, Settings or FloatBar window the next time it is opened; this one covers the two gaps it left: the main window, and windows that are on screen when their browser process dies. Main window. Its open paths (tray menu, Ctrl+Shift+U, set_surface_mode) run on the main thread or in sync commands, where destroying and rebuilding a window inline would block the event loop that has to process Destroyed. shell/window_recovery.rs therefore probes main before every transition and, when it is dead, hands destroy + rebuild to a std::thread and abandons the attempt. The probe is pure Win32 on the native handle captured at build time, so it never waits on the event loop while SHELL_TRANSITION_SERIAL is held. The rebuild uses WebviewWindowBuilder::from_config over the tauri.conf.json entry, so the new window inherits "visible": false and every other declared property, resets the surface state to Hidden to match, then replays the pending request on the main thread via run_on_main_thread. Every path that can notice a dead main (the transition guards, hide-to-tray, ProcessFailed) merges its request into one pending replay, so whichever wins the race to start the rebuild, an open issued meanwhile is still honoured. The replay must not run on the rebuild thread: a transition holds SHELL_TRANSITION_SERIAL while it calls window getters, and a freshly built window receives a Focused(true)/Focused(false) pair whose handler takes the same lock on the main thread, which deadlocked the whole app on every rebuild of a visible main window. ProcessFailed. shell/webview_lifecycle.rs subscribes every window the app builds (main, flyout, Settings, FloatBar, and every rebuilt window) to CoreWebView2's ProcessFailed event through webview2-com, which wry already depends on. Every failure logs a warn with the kind and label. BrowserProcessExited leaves the control unusable and rebuilds the window; RenderProcessExited gets a new render process from WebView2 itself and only reloads the page; the helper-process kinds are log-only. The handler runs inside the COM callback on the UI thread, so it only reads is_visible and outer_position and dispatches: a window that was visible is rebuilt and shown again through its own first-build path (main replays the current surface at its old position, Settings reopens on its default tab at its remembered geometry, the flyout goes through the visible(false) then frontend-reveal handshake); a hidden window is torn down so its next open is a plain first build. main is always rebuilt, hidden, so the next tray click is instant. The FloatBar is torn down and re-applied from settings, since an enabled bar is never re-shown and would otherwise stay blank. Per-window in-flight flags keep the concurrent rebuilds a shared browser process exit causes from stacking, and clear themselves if a rebuild thread panics. webview_recovery gains destroy_and_release for the rebuild threads: Tauri releases a destroyed window's label only when the event loop processes Destroyed, after destroy() returned, and a rebuild issued before that fails with "a window with label already exists". The wait compares native handles, so an open that races the teardown and rebuilds the window first ends the wait instead of timing it out against the new window, and it is bounded in polls rather than wall-clock time because each poll can block behind another window's build on the main thread. The flyout opener waits for an in-flight teardown of its own window for the same reason. The flyout's Focused(false) handler now ignores a never-shown window. Windows reports a focus loss when a hidden window is activated without foreground rights, which happens right after build; treating it as a dismiss cleared the pending reveal and left the rebuilt flyout invisible. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ykxBKGpjDqrWQj7JQVRNm
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Fixes the blank, transparent frame users hit after a WebView2 process exit (#410).
Windows keeps a Tauri window's native frame after the WebView2 browser and render processes die, but the client area then paints nothing. The flyout, Settings, and FloatBar windows are hidden rather than closed, so the dead frame was reused forever and the UI stayed blank until restart.
Detection walks the window's child HWNDs for a Chrome_* render host. A live webview always has one; the orphaned frame after a crash has only WRY_WEBVIEW. When it is missing, the dead window is destroyed so the normal open path builds a fresh one.
Verified the reproduction on a Windows 11 VM: killing the ceiling child msedgewebview2 leaves the window visible with the child tree collapsed from WRY_WEBVIEW > Chrome_WidgetWin_0/1 > Chrome_RenderWidgetHostHWND down to a bare WRY_WEBVIEW, and a window capture is solid black.
Scope: flyout, Settings, and FloatBar, which are opened from async commands or spawned tasks. The main window is not rebuilt here because its open path runs from synchronous Tauri commands, where building a window deadlocks on Windows; that needs an async rebuild path and is a follow-up, as is registering add_ProcessFailed for immediate detection.
Testing: cargo clippy --all-targets -D warnings for x86_64-pc-windows-msvc, cargo check --all-targets on the host, cargo fmt --check. Unit tests cover the Chrome_* class predicate.
Summary by CodeRabbit
Note
Rebuild auxiliary windows when their WebView2 process exits
webview_recoverymodule with Win32 child-window enumeration to detect whether a Tauri window still contains a liveChrome_WebView descendantreclaim_dead_windowdestroys dead labeled windows and returns whether reclamation occurred; destruction failures surface as errors to the calleris_webview_aliveis Windows-only; non-Windows builds never detect dead WebViews. Unreadable or non-Win32 native handles are treated as alive, so a dead WebView under an unexpected handle type will not be reclaimed.Macroscope summarized 3996546.