From a1498f00240cf6710b13993ac362621c405cb074 Mon Sep 17 00:00:00 2001
From: Gaspar Capello <gaspar@igara.com>
Date: Thu, 21 Nov 2024 11:54:52 -0300
Subject: [PATCH] [osx] Fix floating window disappears when another app gains
 focus (fix aseprite/aseprite#4265)

---
 os/osx/app_delegate.h  |  3 +++
 os/osx/app_delegate.mm | 12 ++++++++++++
 os/osx/window.mm       | 13 ++++++++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/os/osx/app_delegate.h b/os/osx/app_delegate.h
index 0bbaf04a9..3910ffeac 100644
--- a/os/osx/app_delegate.h
+++ b/os/osx/app_delegate.h
@@ -23,7 +23,9 @@
   // generate a DropFiles event.
   std::set<std::string> m_cliFiles;
   bool m_isHidden;
+  NSMutableArray<NSWindow*>* m_floatingWindows;
 }
+
 - (id)init;
 - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)sender;
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication*)app;
@@ -39,6 +41,7 @@
 - (void)markCliFileAsProcessed:(const std::string&)fn;
 - (void)resetCliFiles;
 - (BOOL)isHidden;
+- (NSMutableArray<NSWindow*>*) floatingWindows;
 @end
 
 #endif
diff --git a/os/osx/app_delegate.mm b/os/osx/app_delegate.mm
index 61ac23601..13f19229f 100644
--- a/os/osx/app_delegate.mm
+++ b/os/osx/app_delegate.mm
@@ -69,6 +69,7 @@ - (id)init
 {
   if (self = [super init]) {
     m_isHidden = false;
+    m_floatingWindows = [NSMutableArray array];
   }
   return self;
 }
@@ -92,6 +93,9 @@ - (void)applicationWillTerminate:(NSNotification*)notification
 
 - (void)applicationWillResignActive:(NSNotification*)notification
 {
+  for (NSWindow* floatingWindow in self.floatingWindows)
+    floatingWindow.level = NSNormalWindowLevel;
+
   NSEvent* event = [NSApp currentEvent];
   if (event != nil)
     [ViewOSX updateKeyFlags:event];
@@ -102,6 +106,9 @@ - (void)applicationDidBecomeActive:(NSNotification*)notification
   NSEvent* event = [NSApp currentEvent];
   if (event != nil)
     [ViewOSX updateKeyFlags:event];
+
+  for (NSWindow* floatingWindow in self.floatingWindows)
+    floatingWindow.level = NSFloatingWindowLevel;
 }
 
 - (void)applicationDidHide:(NSNotification*)notification
@@ -170,4 +177,9 @@ - (BOOL)isHidden
   return m_isHidden;
 }
 
+- (NSMutableArray<NSWindow*>*) floatingWindows
+{
+  return m_floatingWindows;
+}
+
 @end
diff --git a/os/osx/window.mm b/os/osx/window.mm
index 38148f919..bda8849ce 100644
--- a/os/osx/window.mm
+++ b/os/osx/window.mm
@@ -12,6 +12,7 @@
 #include "os/osx/window.h"
 
 #include "base/debug.h"
+#include "os/osx/app_delegate.h"
 #include "os/event.h"
 #include "os/osx/app.h"
 #include "os/osx/event_queue.h"
@@ -120,7 +121,13 @@ - (WindowOSXObjc*)initWithImpl:(os::WindowOSX*)impl
 
     if (spec->floating()) {
       self.level = NSFloatingWindowLevel;
-      self.hidesOnDeactivate = true;
+      self.hidesOnDeactivate = false;
+      // Needed to keep track all the floating windows pointers
+      // to handle its 'floatingWindow.level' when the application
+      // turns active/inactive inside 'app_delegate.mm'.
+      AppDelegateOSX* delegate = (AppDelegateOSX*)[NSApp delegate];
+      if (delegate)
+        [delegate.floatingWindows addObject:self];
     }
 
     // Hide the "View > Show Tab Bar" menu item
@@ -137,6 +144,10 @@ - (WindowOSXObjc*)initWithImpl:(os::WindowOSX*)impl
 
 - (void)removeImpl
 {
+  AppDelegateOSX* delegate = (AppDelegateOSX*)[NSApp delegate];
+  if (delegate)
+    [delegate.floatingWindows removeObject:self];
+
   [m_view removeImpl];
 
   [self setDelegate:nil];