fix: restore macOS navigation with unsaved forms

native/tests/navigation-macos.m

@@ -17,6 +17,53 @@ static void waitUntil(BOOL (^condition)(void), NSString *message) {
     check(condition(), message);
 }
 
+static id evaluate(WKWebView *webview, NSString *script) {
+    __block BOOL finished = NO;
+    __block id result;
+    [webview evaluateJavaScript:script completionHandler:^(id value, NSError *error) {
+        check(error == nil, error.localizedDescription);
+        result = value;
+        finished = YES;
+    }];
+    waitUntil(^BOOL { return finished; }, @"JavaScript must finish after the confirmation is dismissed");
+    return result;
+}
+
+static NSButton *findButton(NSView *view, NSString *title) {
+    if ([view isKindOfClass:NSButton.class] && [((NSButton *)view).title isEqualToString:title]) {
+        return (NSButton *)view;
+    }
+    for (NSView *child in view.subviews) {
+        NSButton *button = findButton(child, title);
+        if (button) { return button; }
+    }
+    return nil;
+}
+
+static BOOL containsText(NSView *view, NSString *text) {
+    if ([view isKindOfClass:NSTextField.class] && [((NSTextField *)view).stringValue isEqualToString:text]) {
+        return YES;
+    }
+    for (NSView *child in view.subviews) {
+        if (containsText(child, text)) { return YES; }
+    }
+    return NO;
+}
+
+@interface WorkspaceUI : NSObject <WKUIDelegate>
+@property(nonatomic) BOOL closed;
+@property(nonatomic) BOOL uploaded;
+@end
+
+@implementation WorkspaceUI
+- (void)webViewDidClose:(WKWebView *)webView { self.closed = YES; }
+- (void)webView:(WKWebView *)webView runOpenPanelWithParameters:(WKOpenPanelParameters *)parameters
+        initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSArray<NSURL *> *))completionHandler {
+    self.uploaded = YES;
+    completionHandler(nil);
+}
+@end
+
 @interface WorkspacePages : NSObject <WKURLSchemeHandler, WKNavigationDelegate>
 @property(nonatomic) NSUInteger finished;
 @end
@@ -46,9 +93,18 @@ int main(void) {
         [configuration setURLSchemeHandler:pages forURLScheme:@"kanban-test"];
         WKWebView *webview = [[WKWebView alloc] initWithFrame:NSMakeRect(0, 0, 800, 600) configuration:configuration];
         webview.navigationDelegate = pages;
+        WorkspaceUI *originalUI = [WorkspaceUI new];
+        webview.UIDelegate = originalUI;
         check(!webview.allowsBackForwardNavigationGestures, @"WebKit defaults to disabled gestures");
         install_workspace_navigation((__bridge void *)webview);
+        id<WKUIDelegate> installedUI = webview.UIDelegate;
         install_workspace_navigation((__bridge void *)webview);
+        check(webview.UIDelegate == installedUI, @"Installing workspace behavior twice must retain the same delegate");
+        check([installedUI respondsToSelector:@selector(webViewDidClose:)], @"Existing popup callbacks must remain available");
+        [installedUI webViewDidClose:webview];
+        check(originalUI.closed, @"Existing popup callbacks must reach the original delegate");
+        check([installedUI respondsToSelector:@selector(webView:runOpenPanelWithParameters:initiatedByFrame:completionHandler:)],
+            @"Existing file upload callbacks must remain available");
         check(webview.allowsBackForwardNavigationGestures, @"The workspace must enable WebKit's interactive gestures");
         check(webview.configuration.userContentController.userScripts.count == 0, @"Enabling gestures must not inject a history adapter");
         check([webview goBack] == nil && [webview goForward] == nil, @"Empty history must not navigate");
@@ -69,6 +125,41 @@ int main(void) {
         check([webview.URL.path isEqualToString:@"/second"] && webview.canGoBack && !webview.canGoForward,
               @"Forward must restore the second page");
         check(webview.allowsBackForwardNavigationGestures, @"Native gestures must remain enabled across page navigation");
-        puts("PASS: WebKit interactive gesture configuration, full-page back/forward and empty history");
+
+        NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 800, 600)
+            styleMask:NSWindowStyleMaskTitled backing:NSBackingStoreBuffered defer:NO];
+        window.releasedWhenClosed = NO;
+        window.title = @"KanbanGit navigation test";
+        window.contentView = webview;
+        [window orderFront:nil];
+        evaluate(webview, @"document.body.innerHTML = `<input id='duplicate' type='radio'><input id='draft' value='Unsaved project'><input id='upload' type='file'><a id='back' href='#back'>Back</a>`; window.visits = 0; document.querySelector('#back').onclick = event => { event.preventDefault(); if (!document.querySelector('#duplicate').checked || confirm('Discard unsaved changes?')) window.visits++; }; true;");
+        evaluate(webview, @"document.querySelector('#upload').click()");
+        waitUntil(^BOOL { return originalUI.uploaded; }, @"File selection must still reach the original UI delegate");
+        evaluate(webview, @"document.querySelector('#back').click()");
+        check([evaluate(webview, @"window.visits") intValue] == 1, @"Pristine forms must navigate without a confirmation");
+        evaluate(webview, @"document.querySelector('#duplicate').click()");
+        for (NSString *choice in @[@"Cancel", @"OK", @"Cancel", @"OK"]) {
+            __block BOOL finished = NO;
+            [webview evaluateJavaScript:@"document.querySelector('#back').click()" completionHandler:^(id result, NSError *error) {
+                check(error == nil, error.localizedDescription);
+                finished = YES;
+            }];
+            waitUntil(^BOOL { return window.attachedSheet != nil; }, @"Dirty form navigation must show a native confirmation");
+            check(!finished, @"The original click must wait for the user's decision");
+            check(containsText(window.attachedSheet.contentView, @"workspace"), @"The confirmation must identify the requesting website");
+            check(containsText(window.attachedSheet.contentView, @"Discard unsaved changes?"), @"The confirmation must show the application's message");
+            NSButton *button = findButton(window.attachedSheet.contentView, choice);
+            check(button != nil, @"The native confirmation must offer OK and Cancel");
+            [button performClick:nil];
+            waitUntil(^BOOL { return finished && window.attachedSheet == nil; }, @"Dismissal must release the original navigation");
+            check([evaluate(webview, @"document.querySelector('#draft').value") isEqualToString:@"Unsaved project"],
+                @"Cancelling a confirmation must preserve the draft");
+        }
+        check([evaluate(webview, @"window.visits") intValue] == 3, @"Only accepted visits must run, exactly once each");
+        window.contentView = nil;
+        check(![evaluate(webview, @"confirm('Detached view')") boolValue], @"A detached view must cancel and release JavaScript immediately");
+        [window orderOut:nil];
+        [window close];
+        puts("PASS: WebKit interactive gesture configuration, full-page back/forward, native confirmations and delegate forwarding");
     }
 }

native/tests/navigation-macos.test.js

@@ -8,7 +8,7 @@ import test from 'node:test';
 import { fileURLToPath } from 'node:url';
 
 test(
-    'WebKit owns interactive navigation and preserves native back/forward history',
+    'WebKit preserves history and confirms dirty form navigation without losing delegate callbacks',
     { skip: process.platform !== 'darwin' },
     () => {
         const directory = mkdtempSync(join(tmpdir(), 'kanbangit-navigation-'));
@@ -48,7 +48,7 @@ test(
             assert.equal(
                 result.status,
                 0,
-                result.stderr || result.error?.message,
+                result.stderr || result.error?.message || result.signal,
             );
             assert.match(result.stdout, /PASS: WebKit/);
         } finally {