From 76239d6da4e0176bccf1b5124084af0aeca89fcc Mon Sep 17 00:00:00 2001
From: Tim Horton <timothy_horton@apple.com>
Date: Thu, 2 Mar 2023 00:22:01 -0800
Subject: [PATCH] Fullscreen UIScene adjustments are not reverted if the Web
 Content process crashes while in fullscreen
 https://bugs.webkit.org/show_bug.cgi?id=253216 rdar://106107254

Reviewed by Aditya Keerthi.

* Source/WebKit/UIProcess/ios/fullscreen/WKFullScreenWindowControllerIOS.mm:
(-[WKFullScreenWindowController _exitFullscreenImmediately]):
Perform the fullscreen transition without animation if exiting fullscreen "immediately",
which happens in cases such as Web Content process crash or WKWebView unparenting.
This ensures that all of the scene/window cleanup work happens even if we don't go through
the usual animated dismissal path.

Canonical link: https://commits.webkit.org/261051@main
---
 .../ios/fullscreen/WKFullScreenWindowControllerIOS.mm      | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Source/WebKit/UIProcess/ios/fullscreen/WKFullScreenWindowControllerIOS.mm b/Source/WebKit/UIProcess/ios/fullscreen/WKFullScreenWindowControllerIOS.mm
index 43a2df6fee33..1b6c527b63cd 100644
--- a/Source/WebKit/UIProcess/ios/fullscreen/WKFullScreenWindowControllerIOS.mm
+++ b/Source/WebKit/UIProcess/ios/fullscreen/WKFullScreenWindowControllerIOS.mm
@@ -1082,6 +1082,13 @@ - (void)_exitFullscreenImmediately
     if (page)
         page->setSuppressVisibilityUpdates(true);
 
+#if ENABLE(FULLSCREEN_WINDOW_EFFECTS)
+    [UIView performWithoutAnimation:^{
+        CompletionHandler<void()> completionHandler = []() { };
+        performFullscreenTransition(_lastKnownParentWindow.get(), _window.get(), _parentWindowState.get(), false, WTFMove(completionHandler));
+    }];
+#endif
+
     [self _reinsertWebViewUnderPlaceholder];
 
     if (auto* manager = self._manager) {