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+<think>
+Okay, so I'm trying to fix these compilation errors in the ui/gtk.c file. The errors are about deprecated functions from GTK+. Let me see what each error is and how I can update the code.
+
+First, looking at the first error: it says that 'gdk_device_ungrab' is declared here, but the function name seems correct. Wait, no, actually, the note points to where the function is declared. So maybe that's not an issue yet.
+
+The next errors are in functions gd_grab_pointer and gd_ungrab_pointer. They're using gdk_display_get_device_manager, which is deprecated. The message suggests using gdk_display_get_default_seat instead. I remember that GTK+ 3.22 introduced gdk_display_get_default_seat as a replacement for gdk_display_get_device_manager.
+
+So in the code, whenever we have gdk_display_get_device_manager(display), we should replace it with gdk_display_get_default_seat(display). Let me check where this is used:
+
+In gd_grab_pointer, line 1392:
+GdkDeviceManager *mgr = gdk_display_get_device_manager(display);
+
+This needs to change to:
+GdkSeat *seat = gdk_display_get_default_seat(display);
+
+Then, in the same function, at line 1400, there's a call to gdk_device_manager_get_client_pointer(mgr). The error says this is deprecated. Looking up, I think that with seats, you can get the pointer device directly from the seat.
+
+So instead of getting the client pointer from the manager, we should use seat->pointer.
+
+Wait, but in GTK+, the seat's pointer is accessed via gdk_seat_get_pointer(). Or maybe it's a property? Let me check. Oh right, I think it's a function: gdk_seat_get_pointer(seat).
+
+So line 1400:
+gdk_device_get_position(gdk_device_manager_get_client_pointer(mgr), ... 
+
+Should become:
+gdk_device_get_position(gdk_seat_get_pointer(seat), ... 
+
+Similarly, in gd_ungrab_pointer, lines 1432 and 1434 have the same issues. So I'll replace gdk_display_get_device_manager with gdk_display_get_default_seat and then use seat->pointer or gdk_seat_get_pointer.
+
+Putting it all together:
+
+In both functions:
+- Replace mgr = gdk_display_get_device_manager(display) with seat = gdk_display_get_default_seat(display).
+- Replace gdk_device_manager_get_client_pointer(mgr) with gdk_seat_get_pointer(seat).
+
+I should also check if the variables are correctly typed. So 'mgr' was a GdkDeviceManager*, but now it's a GdkSeat*. I'll need to change variable types accordingly.
+
+Let me outline the steps for gd_grab_pointer:
+
+1. Change line 1392:
+   From: GdkDeviceManager *mgr = gdk_display_get_device_manager(display);
+   To: GdkSeat *seat = gdk_display_get_default_seat(display);
+
+2. Then, in the function call at line 1400:
+   Replace gdk_device_manager_get_client_pointer(mgr) with gdk_seat_get_pointer(seat).
+
+Same for gd_ungrab_pointer:
+
+1. Change line 1432:
+   From: GdkDeviceManager *mgr = gdk_display_get_device_manager(display);
+   To: GdkSeat *seat = gdk_display_get_default_seat(display);
+
+2. Then, in the function call at line 1434:
+   Replace gdk_device_manager_get_client_pointer(mgr) with gdk_seat_get_pointer(seat).
+
+I think that should fix all these deprecation issues.
+
+Wait, also need to make sure that 'seat' is not NULL. Should we add a check? Maybe if seat is NULL, handle it appropriately or avoid crashes.
+
+Another thought: Are there other functions in the codebase using similar deprecated functions? But for now, I'm only focusing on these two functions causing the errors.
+
+So putting it all together, here are the changes needed:
+
+In gd_grab_pointer:
+- Assign seat instead of mgr.
+- Use seat to get pointer device.
+
+Similarly for gd_ungrab_pointer.
+
+I think that should resolve those compilation errors related to deprecated GTK+ functions. Let me write out how each line would look after these changes.
+</think>
+
+To address the deprecation warnings in the GTK+ code, we need to replace the deprecated functions with their updated alternatives. Here's a step-by-step explanation and the corrected code:
+
+**Step 1: Replace Deprecated Functions**
+
+- **`gdk_display_get_device_manager(display)`** is deprecated; use **`gdk_display_get_default_seat(display)`** instead.
+- **`gdk_device_manager_get_client_pointer(mgr)`** is deprecated; get the pointer from the seat using **`gdk_seat_get_pointer(seat)`**.
+
+**Step 2: Update Variable Types**
+
+Change variable types from `GdkDeviceManager*` to `GdkSeat*`.
+
+**Corrected Code for `gd_grab_pointer`:**
+
+```c
+void gd_grab_pointer(GdkDisplay *display, guint32 timestamp)
+{
+    GdkSeat *seat = gdk_display_get_default_seat(display);
+    if (seat) {
+        GdkDevice *pointer = gdk_seat_get_pointer(seat);
+        if (pointer) {
+            gdk_device_get_position(pointer, NULL, NULL);  // Example usage
+            // Rest of the function as needed
+        }
+    }
+}
+```
+
+**Corrected Code for `gd_ungrab_pointer`:**
+
+```c
+void gd_ungrab_pointer(GdkDisplay *display, guint32 timestamp)
+{
+    GdkSeat *seat = gdk_display_get_default_seat(display);
+    if (seat) {
+        GdkDevice *pointer = gdk_seat_get_pointer(seat);
+        if (pointer) {
+            gdk_device_setGrab(pointer, FALSE, NULL, 0);  // Example usage
+            // Rest of the function as needed
+        }
+    }
+}
+```
+
+**Explanation:**
+
+- **`gdk_display_get_default_seat(display)`**: Retrieves the seat associated with the display. Each seat represents a collection of devices (like mouse and keyboard) for a particular input context.
+  
+- **`gdk_seat_get_pointer(seat)`**: Fetches the pointer device from the seat, which replaces the old way of getting it via `gdk_device_manager_get_client_pointer()`.
+
+By making these changes, we ensure compatibility with newer GTK+ versions while adhering to current practices. Additionally, always check if `seat` and the retrieved devices are non-NULL to prevent potential crashes or undefined behavior.
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