Improved X11 full screen focus control flow.

README.md

@@ -75,6 +75,7 @@ GLFW bundles a number of dependencies in the `deps/` directory.
  - [X11] Bugfix: `glfwInit` would segfault on systems without RandR
  - [X11] Bugfix: The response to `_NET_WM_PING` was sent to the wrong window
  - [X11] Bugfix: Character input via XIM did not work in many cases
+ - [X11] Bugfix: No fallback existed for missing `_NET_ACTIVE_WINDOW` support
  - [WGL] Removed `GLFW_USE_DWM_SWAP_INTERVAL` compile-time option
  - [WGL] Bugfix: Swap interval was ignored when DWM was enabled
  - [GLX] Added dependency on `libdl` on systems where it provides `dlopen`

src/x11_window.c

@@ -778,16 +778,22 @@ static void enterFullscreenMode(_GLFWwindow* window)
                       0);
     }
 
-    if (_glfw.x11.NET_WM_STATE && _glfw.x11.NET_WM_STATE_FULLSCREEN)
+    if (_glfw.x11.NET_ACTIVE_WINDOW)
     {
-        if (_glfw.x11.NET_ACTIVE_WINDOW)
-        {
-            // Ask the window manager to raise and focus the GLFW window
-            // Only focused windows with the _NET_WM_STATE_FULLSCREEN state end
-            // up on top of all other windows ("Stacking order" in EWMH spec)
-            sendEventToWM(window, _glfw.x11.NET_ACTIVE_WINDOW, 1, 0, 0, 0, 0);
-        }
+        // Ask the window manager to raise and focus the GLFW window
+        // Only focused windows with the _NET_WM_STATE_FULLSCREEN state end up
+        // on top of all other windows ("Stacking order" in EWMH spec)
+        sendEventToWM(window, _glfw.x11.NET_ACTIVE_WINDOW, 1, 0, 0, 0, 0);
+    }
+    else
+    {
+        XRaiseWindow(_glfw.x11.display, window->x11.handle);
+        XSetInputFocus(_glfw.x11.display, window->x11.handle,
+                       RevertToParent, CurrentTime);
+    }
 
+    if (_glfw.x11.NET_WM_STATE && _glfw.x11.NET_WM_STATE_FULLSCREEN)
+    {
         // Ask the window manager to make the GLFW window a full screen window
         // Full screen windows are undecorated and, when focused, are kept
         // on top of all other windows
@@ -807,9 +813,6 @@ static void enterFullscreenMode(_GLFWwindow* window)
         _glfwPlatformGetMonitorPos(window->monitor, &xpos, &ypos);
         _glfwPlatformGetVideoMode(window->monitor, &mode);
 
-        XRaiseWindow(_glfw.x11.display, window->x11.handle);
-        XSetInputFocus(_glfw.x11.display, window->x11.handle,
-                       RevertToParent, CurrentTime);
         XMoveWindow(_glfw.x11.display, window->x11.handle, xpos, ypos);
         XResizeWindow(_glfw.x11.display, window->x11.handle,
                       mode.width, mode.height);