X11: Fix invalid read when clearing GLFW_FLOATING

README.md

@@ -149,6 +149,7 @@ information on what to include when reporting a bug.
  - [X11] Bugfix: Decorations could not be enabled after window creation (#1566)
  - [X11] Bugfix: Content scale fallback value could be inconsistent (#1578)
  - [X11] Bugfix: `glfwMaximizeWindow` had no effect on hidden windows
+ - [X11] Bugfix: Clearing `GLFW_FLOATING` on a hidden window caused invalid read
  - [Wayland] Bugfix: The `GLFW_HAND_CURSOR` shape used the wrong image (#1432)
  - [Wayland] Bugfix: `CLOCK_MONOTONIC` was not correctly enabled
  - [POSIX] Bugfix: `CLOCK_MONOTONIC` was not correctly tested for or enabled

src/x11_window.c

@@ -2668,7 +2668,7 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
 
             XChangeProperty(_glfw.x11.display, window->x11.handle,
                             _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
-                            PropModeReplace, (unsigned char*) &states, count);
+                            PropModeReplace, (unsigned char*) states, count);
         }
 
         XFree(states);