Wayland: Fix maximization by user being ignored

The internal maximization state was not updated when an event was
received that the user had changed the maximization state of a window,
and no maximization events were emitted.

This affected both the GLFW_MAXIMIZED attribute and glfwRestoreWindow.

(cherry picked from commit f39ffefb6a)

README.md

@@ -154,6 +154,9 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: A window leaving full screen mode ignored its desired size
  - [Wayland] Bugfix: `glfwSetWindowMonitor` did not update windowed mode size
  - [Wayland] Bugfix: `glfwRestoreWindow` would make a full screen window windowed
+ - [Wayland] Bugfix: A window maximized or restored by the user would enter an
+   inconsistent state
+ - [Wayland] Bugfix: Window maximization events were not emitted
 
 
 ## Contact

src/wl_window.c

@@ -558,7 +558,13 @@ static void xdgToplevelHandleConfigure(void* userData,
             _glfwPlatformIconifyWindow(window);
     }
 
+    if (window->wl.maximized && !maximized)
+        _glfwInputWindowMaximize(window, GLFW_FALSE);
+    else if (maximized && !window->wl.maximized)
+        _glfwInputWindowMaximize(window, GLFW_TRUE);
+
     window->wl.activated = activated;
+    window->wl.maximized = maximized;
 }
 
 static void xdgToplevelHandleClose(void* userData,
@@ -1976,18 +1982,12 @@ void _glfwPlatformRestoreWindow(_GLFWwindow* window)
         // There is no way to unset minimized, or even to know if we are
         // minimized, so there is nothing to do here.
     }
-
-    window->wl.maximized = GLFW_FALSE;
 }
 
 void _glfwPlatformMaximizeWindow(_GLFWwindow* window)
 {
     if (window->wl.xdg.toplevel)
-    {
         xdg_toplevel_set_maximized(window->wl.xdg.toplevel);
-    }
-
-    window->wl.maximized = GLFW_TRUE;
 }
 
 void _glfwPlatformShowWindow(_GLFWwindow* window)