X11: Fix glfwSetWindowMonitor not updating hints

This makes glfwSetWindowMonitor update the WM_NORMAL_HINTS when resizing
non-user-resizable windowed mode windows.

README.md

@@ -245,6 +245,8 @@ information on what to include when reporting a bug.
 - [X11] Bugfix: NVidia EGL would segfault if unloaded before closing the display
 - [X11] Bugfix: Checking window maximized attrib could crash some WMs (#1356)
 - [X11] Bugfix: Update cursor position on enter event (#1366)
+- [X11] Bugfix: `glfwSetWindowMonitor` did not update hints when resizing
+                non-user-resizable windows
 - [Linux] Added workaround for missing `SYN_DROPPED` in pre-2.6.39 kernel
           headers (#1196)
 - [Linux] Moved to evdev for joystick input (#906,#1005)

src/x11_window.c

@@ -2403,6 +2403,9 @@ void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
         }
         else
         {
+            if (!window->resizable)
+                updateNormalHints(window, width, height);
+
             XMoveResizeWindow(_glfw.x11.display, window->x11.handle,
                               xpos, ypos, width, height);
         }