From 6bf6fcaa51ecd5d55c977be31c77bc6ff5d7e29c Mon Sep 17 00:00:00 2001
From: Smit Barmase <heysmitbarmase@gmail.com>
Date: Wed, 12 Mar 2025 14:59:27 +0000
Subject: [PATCH] macOS: Fix window turning black on fullscreen mode (#26547)

Closes #26534

Recently, we fixed a title bar transparency issue that only occurred on
macOS 15.3 and later. PR:
https://github.com/zed-industries/zed/pull/26403

However, this seems to have broken multi-window fullscreen behavior on
earlier macOS versions. This PR adds versioning so that the title bar
transparency fix only applies to macOS 15.3.0 and later.

No release notes, as this bug only exists on main right now.

Release Notes:

- N/A

Co-authored-by: MrSubidubi <dev@bahn.sh>
---
 crates/gpui/src/platform/mac/window.rs | 29 +++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/crates/gpui/src/platform/mac/window.rs b/crates/gpui/src/platform/mac/window.rs
index 382ae6f7a7..5046a9d041 100644
--- a/crates/gpui/src/platform/mac/window.rs
+++ b/crates/gpui/src/platform/mac/window.rs
@@ -1498,21 +1498,44 @@ extern "C" fn window_will_enter_fullscreen(this: &Object, _: Sel, _: id) {
     let window_state = unsafe { get_window_state(this) };
     let mut lock = window_state.as_ref().lock();
     lock.fullscreen_restore_bounds = lock.bounds();
-    unsafe {
-        lock.native_window.setTitlebarAppearsTransparent_(NO);
+
+    if is_macos_version_at_least(15, 3, 0) {
+        unsafe {
+            lock.native_window.setTitlebarAppearsTransparent_(NO);
+        }
     }
 }
 
 extern "C" fn window_will_exit_fullscreen(this: &Object, _: Sel, _: id) {
     let window_state = unsafe { get_window_state(this) };
     let mut lock = window_state.as_ref().lock();
-    if lock.transparent_titlebar {
+
+    if is_macos_version_at_least(15, 3, 0) && lock.transparent_titlebar {
         unsafe {
             lock.native_window.setTitlebarAppearsTransparent_(YES);
         }
     }
 }
 
+#[repr(C)]
+struct NSOperatingSystemVersion {
+    major_version: NSInteger,
+    minor_version: NSInteger,
+    patch_version: NSInteger,
+}
+
+fn is_macos_version_at_least(major: NSInteger, minor: NSInteger, patch: NSInteger) -> bool {
+    unsafe {
+        let process_info: id = msg_send![class!(NSProcessInfo), processInfo];
+        let os_version: NSOperatingSystemVersion = msg_send![process_info, operatingSystemVersion];
+        (os_version.major_version > major)
+            || (os_version.major_version == major && os_version.minor_version > minor)
+            || (os_version.major_version == major
+                && os_version.minor_version == minor
+                && os_version.patch_version >= patch)
+    }
+}
+
 extern "C" fn window_did_move(this: &Object, _: Sel, _: id) {
     let window_state = unsafe { get_window_state(this) };
     let mut lock = window_state.as_ref().lock();