diff -urN wine-11.16-orig/dlls/winex11.drv/mouse.c wine-11.16/dlls/winex11.drv/mouse.c
--- wine-11.16-orig/dlls/winex11.drv/mouse.c	2026-08-22 05:25:07 +0900
+++ wine-11.16/dlls/winex11.drv/mouse.c	2026-09-04 18:01:44 +0900
@@ -479,43 +479,60 @@
 }
 
 
-/* Map the input event coordinates so they're relative to the desktop. */
-static POINT map_event_coords( HWND hwnd, Window window, Window event_root, POINT root, POINT src )
+/* Map the input event coordinates so they're relative to the desktop.
+ * Return whether the coordinates were inside the window */
+static BOOL map_event_coords( HWND hwnd, Window window, Window event_root, POINT root, POINT src, POINT *dst )
 {
     struct x11drv_thread_data *thread_data;
     struct x11drv_win_data *data;
-    POINT dst = src;
+    BOOL inside;
 
-    TRACE( "hwnd %p, window %lx, event_root %lx, root %s, src %s\n", hwnd, window, event_root,
-           wine_dbgstr_point( &root ), wine_dbgstr_point( &src ) );
+    TRACE( "hwnd %p, window %lx, event_root %lx, root %s, src %s, dst %p\n", hwnd, window, event_root,
+           wine_dbgstr_point( &root ), wine_dbgstr_point( &src ), dst );
 
-    if (window == root_window) dst = root_to_virtual_screen( src.x, src.y );
-    else if (event_root == root_window) dst = root_to_virtual_screen( root.x, root.y );
+    *dst = src;
+    inside = TRUE;
+    data = hwnd ? get_win_data( hwnd ) : NULL;
+
+    if (window == root_window) *dst = root_to_virtual_screen( src.x, src.y );
+    else if (event_root == root_window) *dst = root_to_virtual_screen( root.x, root.y );
     else if (!hwnd)
     {
         thread_data = x11drv_thread_data();
-        if (!thread_data->clipping_cursor) return dst;
-        if (thread_data->clip_window != window) return dst;
-        dst.x += clip_rect.left;
-        dst.y += clip_rect.top;
+        if (thread_data->clipping_cursor && thread_data->clip_window == window)
+        {
+            dst->x += clip_rect.left;
+            dst->y += clip_rect.top;
+        }
     }
-    else if ((data = get_win_data( hwnd )))
+    else if (data)
     {
         if (window == data->client_window)
         {
-            dst.x += data->rects.client.left;
-            dst.y += data->rects.client.top;
+            dst->x += data->rects.client.left;
+            dst->y += data->rects.client.top;
+            if (dst->x >= data->rects.client.right - data->rects.client.left)
+                inside = FALSE;
+            if (dst->y >= data->rects.client.bottom - data->rects.client.top)
+                inside = FALSE;
         }
         else
         {
-            dst.x += data->rects.visible.left;
-            dst.y += data->rects.visible.top;
+            dst->x += data->rects.visible.left;
+            dst->y += data->rects.visible.top;
+            if (dst->x >= data->rects.visible.right - data->rects.visible.left)
+                inside = FALSE;
+            if (dst->y >= data->rects.visible.bottom - data->rects.visible.top)
+                inside = FALSE;
         }
-        release_win_data( data );
+        if (dst->x < 0 || dst->y < 0) inside = FALSE;
     }
 
-    TRACE( "mapped %s to %s\n", wine_dbgstr_point( &src ), wine_dbgstr_point( &dst ) );
-    return dst;
+    if (data) release_win_data( data );
+
+    TRACE( "mapped %s to %s (inside=%d)\n",
+           wine_dbgstr_point( &src ), wine_dbgstr_point( dst ), inside );
+    return inside;
 }
 
 static void send_mouse_input( HWND hwnd, POINT pos, UINT flags, UINT data, UINT time, const struct raw_mouse *raw )
@@ -1501,8 +1518,8 @@
         release_win_data( data );
     }
 
-    pt = map_event_coords( hwnd, event->window, event->root, root, pt );
-    send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE | flags, button_down_data[button], time, NULL );
+    if (map_event_coords( hwnd, event->window, event->root, root, pt, &pt ))
+        send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE | flags, button_down_data[button], time, NULL );
     return TRUE;
 }
 
@@ -1520,8 +1537,8 @@
 
     TRACE( "hwnd %p/%lx button %u pos %s\n", hwnd, event->window, button, wine_dbgstr_point( &pt ) );
 
-    pt = map_event_coords( hwnd, event->window, event->root, root, pt );
-    send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE | flags, button_up_data[button], time, NULL );
+    if (map_event_coords( hwnd, event->window, event->root, root, pt, &pt ))
+        send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE | flags, button_up_data[button], time, NULL );
     return TRUE;
 }
 
@@ -1544,7 +1561,7 @@
         return FALSE;
     }
 
-    pt = map_event_coords( hwnd, event->window, event->root, root, pt );
+    map_event_coords( hwnd, event->window, event->root, root, pt, &pt );
     send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE, 0, time, NULL );
     return TRUE;
 }
@@ -1571,7 +1588,7 @@
         return FALSE;
     }
 
-    pt = map_event_coords( hwnd, event->window, event->root, root, pt );
+    map_event_coords( hwnd, event->window, event->root, root, pt, &pt );
     send_mouse_input( hwnd, pt, MOUSEEVENTF_ABSOLUTE, 0, time, NULL );
     return TRUE;
 }
@@ -1687,7 +1704,7 @@
     int flags = 0;
     POINT pos;
 
-    pt = map_event_coords( hwnd, event->event, event->root, root, pt );
+    map_event_coords( hwnd, event->event, event->root, root, pt, &pt );
     pos.x = pt.x * 65535 / (virtual.right - virtual.left);
     pos.y = pt.y * 65535 / (virtual.bottom - virtual.top);