This fixes pressed keys being stuck when the deck is clicked and the
window loses focus.

In the past, Gustavo Noronha Silva also had a patch to fix this issue
though it only ungrabs mouse and does not release keys, and depends on
another out-of-tree patch:
https://github.com/akihikodaki/qemu/pull/3/commits/e906a80147b1dc6d4f31b6a08064ef9871a2b76c

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
 ui/cocoa.m | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/ui/cocoa.m b/ui/cocoa.m
index 52e750f8a29..ac1cee09cd0 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -1330,10 +1330,15 @@ - (BOOL)windowShouldClose:(id)sender
     return NO;
 }
 
-/* Called when QEMU goes into the background */
-- (void) applicationWillResignActive: (NSNotification *)aNotification
+/*
+ * Called when QEMU goes into the background. Note that
+ * [-NSWindowDelegate windowDidResignKey:] is used here instead of
+ * [-NSApplicationDelegate applicationWillResignActive:] because it cannot
+ * detect that the window loses focus when the deck is clicked on macOS 13.2.1.
+ */
+- (void) windowDidResignKey: (NSNotification *)aNotification
 {
-    COCOA_DEBUG("QemuCocoaAppController: applicationWillResignActive\n");
+    COCOA_DEBUG("%s\n", __func__);
     [cocoaView ungrabMouse];
     [cocoaView raiseAllKeys];
 }
-- 
2.37.1 (Apple Git-137.1)