X11: Fix function returning before cleanup

The _glfwPlatformSetWindowFloating function would return without freeing
the state array if the window was already in the requested state.

(cherry picked from commit 071d7c0f46841c884b1ac0c493e34143a01f0c04)

README.md

@@ -126,6 +126,7 @@ information on what to include when reporting a bug.
  - [Win32] Bugfix: Compilation with LLVM for Windows failed (#1807,#1824,#1874)
  - [Cocoa] Bugfix: The MoltenVK layer contents scale was updated only after
    related events were emitted
+ - [X11] Bugfix: Changing `GLFW_FLOATING` could leak memory
  - [NSGL] Bugfix: Defining `GL_SILENCE_DEPRECATION` externally caused
    a duplicate definition warning (#1840)
  - [EGL] Bugfix: The `GLFW_DOUBLEBUFFER` context attribute was ignored (#1843)

src/x11_window.c

@@ -2686,14 +2686,14 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
                     break;
             }
 
-            if (i < count)
-                return;
-
-            XChangeProperty(_glfw.x11.display, window->x11.handle,
-                            _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
-                            PropModeAppend,
-                            (unsigned char*) &_glfw.x11.NET_WM_STATE_ABOVE,
-                            1);
+            if (i == count)
+            {
+                XChangeProperty(_glfw.x11.display, window->x11.handle,
+                                _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
+                                PropModeAppend,
+                                (unsigned char*) &_glfw.x11.NET_WM_STATE_ABOVE,
+                                1);
+            }
         }
         else if (states)
         {
@@ -2703,15 +2703,15 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
                     break;
             }
 
-            if (i == count)
-                return;
-
-            states[i] = states[count - 1];
-            count--;
+            if (i < count)
+            {
+                states[i] = states[count - 1];
+                count--;
 
-            XChangeProperty(_glfw.x11.display, window->x11.handle,
-                            _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
-                            PropModeReplace, (unsigned char*) states, count);
+                XChangeProperty(_glfw.x11.display, window->x11.handle,
+                                _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
+                                PropModeReplace, (unsigned char*) states, count);
+            }
         }
 
         if (states)