fix: set fullscreen-compatible behavior BEFORE making window visible

Previous fix set collection behavior after setVisible(true) which is
too late — macOS has already assigned the window to a Space.

Now sets canJoinAllSpaces + fullScreenAuxiliary + stationary (1<<4)
BEFORE the window becomes visible. Also uses NSPanel-level behavior
and moves window to active Space explicitly via orderWindow:relativeTo:.

If this still fails in fullscreen, the only remaining option is to
render the plugin GUI in-process (framebuffer sharing).

Source/Helper/HelperPluginHost.cpp

@@ -9,37 +9,46 @@
 #include <objc/message.h>
 #endif
 
-// Show window as floating panel without activating this app or stealing focus
-// Works in BOTH windowed and fullscreen mode
-static void showAsFloatingPanel(juce::Component* window)
+// Configure window for floating-panel behavior that works in fullscreen
+// MUST be called BEFORE the window is made visible
+static void configureAsOverlayPanel(juce::Component* window)
 {
 #if JUCE_MAC
     if (auto* peer = window->getPeer())
     {
         auto* nsWindow = (id)peer->getNativeHandle();
 
-        // --- COLLECTION BEHAVIOR (critical for fullscreen) ---
-        // canJoinAllSpaces = 1 << 0  (window appears on ALL Spaces/desktops)
-        // fullScreenAuxiliary = 1 << 8  (window can float over fullscreen apps)
-        // Combined = 257
-        long behavior = (1 << 0) | (1 << 8);
+        // --- COLLECTION BEHAVIOR (MUST be set before visible) ---
+        // canJoinAllSpaces       = 1 << 0   (appear on all desktops/spaces)
+        // fullScreenAuxiliary    = 1 << 8   (can appear over fullscreen apps)
+        // stationary             = 1 << 4   (don't move with space switches)
+        // ignoresCycle           = 1 << 6   (skip in Cmd+` cycling)
+        long behavior = (1 << 0) | (1 << 8) | (1 << 4) | (1 << 6);
         ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setCollectionBehavior:"), behavior);
 
         // --- WINDOW LEVEL ---
-        // NSStatusWindowLevel = 25 (above fullscreen apps)
-        // NSFloatingWindowLevel = 3 is NOT enough — fullscreen apps are higher
+        // Level 25 = NSStatusWindowLevel (above fullscreen apps)
         ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setLevel:"), 25);
 
-        // Don't hide on deactivate (stay visible when helper loses focus)
+        // Don't hide when the helper app loses focus
         ((void(*)(id, SEL, int))objc_msgSend)(nsWindow, sel_registerName("setHidesOnDeactivate:"), 0);
+    }
+#endif
+}
 
-        // Show without activating this app
+// Make the window appear without stealing focus (call AFTER visible)
+static void showWithoutFocusSteal(juce::Component* window)
+{
+#if JUCE_MAC
+    if (auto* peer = window->getPeer())
+    {
+        auto* nsWindow = (id)peer->getNativeHandle();
         ((void(*)(id, SEL))objc_msgSend)(nsWindow, sel_registerName("orderFrontRegardless"));
     }
 #endif
 }
 
-// Custom window
+// Custom window — no native title bar close issues with accessory policy
 class PluginGuiWindow : public juce::DocumentWindow
 {
 public:
@@ -285,8 +294,10 @@ void HelperPluginHost::showGui()
         // If window exists but hidden, just show it
         if (guiWindow)
         {
+            // Re-apply overlay config before showing (in case Space changed)
+            configureAsOverlayPanel(guiWindow.get());
             guiWindow->setVisible(true);
-            showAsFloatingPanel(guiWindow.get());
+            showWithoutFocusSteal(guiWindow.get());
             return;
         }
 
@@ -297,10 +308,15 @@ void HelperPluginHost::showGui()
         guiWindow->setContentOwned(editor, true);
         guiWindow->setResizable(true, true);
         guiWindow->centreWithSize(editor->getWidth(), editor->getHeight());
+
+        // CRITICAL: configure overlay behavior BEFORE making visible
+        configureAsOverlayPanel(guiWindow.get());
+
+        // NOW make visible
         guiWindow->setVisible(true);
 
-        // Make it float without stealing focus — works in windowed AND fullscreen
-        showAsFloatingPanel(guiWindow.get());
+        // Show without stealing focus from Ableton
+        showWithoutFocusSteal(guiWindow.get());
     });
 }