MacPDF: Add some temporary logging for application restoring

In the end, apparently I had "Close windows when quitting an
application" enabled in Desktop & Dock in System Settings. With that
turned off, it just worked (...but I still need to serialize the current
page in the view).

Even with it turned off, cmd-opt-q would "Quit and Keep Windows",
so I could've also used that for testing.

Meta/Lagom/Contrib/MacPDF/LagomPDFDocument.mm

@@ -46,11 +46,38 @@
 - (void)windowControllerDidLoadNib:(NSWindowController*)aController
 {
     [super windowControllerDidLoadNib:aController];
+
+    NSLog(@"restorationClass %@", aController.window.restorationClass);
+    NSLog(@"restorable %@", @(aController.window.restorable));
+    NSLog(@"identifier %@", aController.window.identifier);
+
     if (_doc) {
         [_pdfView setDocument:_doc->make_weak_ptr()];
     }
 }
 
++ (NSArray<Class>*)allowedClassesForRestorableStateKeyPath:(NSString*)keyPath
+{
+    auto res = [NSDocument allowedClassesForRestorableStateKeyPath:keyPath];
+    NSLog(@"restore %@", res);
+    return res;
+}
+
+- (void)restoreDocumentWindowWithIdentifier:(NSUserInterfaceItemIdentifier)identifier
+                                      state:(NSCoder*)state
+                          completionHandler:(void (^)(NSWindow*, NSError*))completionHandler
+{
+    NSLog(@"here restoreDocumentWindowWithIdentifier");
+    return [super restoreDocumentWindowWithIdentifier:identifier state:state completionHandler:completionHandler];
+}
+
+- (void)encodeRestorableStateWithCoder:(NSCoder*)coder
+{
+    // called on switch away from app
+    NSLog(@"here encodeRestorableStateWithCoder");
+    [super encodeRestorableStateWithCoder:coder];
+}
+
 - (NSData*)dataOfType:(NSString*)typeName error:(NSError**)outError
 {
     // Insert code here to write your document to data of the specified type. If outError != NULL, ensure that you create and set an appropriate error if you return nil.

Meta/Lagom/Contrib/MacPDF/LagomPDFView.mm

@@ -73,6 +73,7 @@ static NSBitmapImageRep* ns_from_gfx(NonnullRefPtr<Gfx::Bitmap> bitmap_p)
 {
     if (!_doc || _doc->get_page_count() == 0)
         return;
+    [self invalidateRestorableState];
     NSSize pixel_size = [self convertSizeToBacking:self.bounds.size];
     if (auto bitmap_or = render(*_doc, _page_index, pixel_size); !bitmap_or.is_error())
         _rep = ns_from_gfx(bitmap_or.value());
@@ -112,4 +113,14 @@ static NSBitmapImageRep* ns_from_gfx(NonnullRefPtr<Gfx::Bitmap> bitmap_p)
         [self setNeedsDisplay:YES];
     }
 }
+
+- (void)encodeRestorableStateWithCoder:(NSCoder*)coder
+{
+    NSLog(@"FIXME encodeRestorableStateWithCoder");
+}
+
+- (void)restoreStateWithCoder:(NSCoder*)coder
+{
+    NSLog(@"FIXME restoreStateWithCoder");
+}
 @end