Add support for EWMH _NET_WM_WINDOW_TYPE

src/x11_init.c

@@ -460,6 +460,10 @@ static void detectEWMH(void)
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_PID");
     _glfw.x11.NET_WM_PING =
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_PING");
+    _glfw.x11.NET_WM_WINDOW_TYPE =
+        getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_WINDOW_TYPE");
+    _glfw.x11.NET_WM_WINDOW_TYPE_NORMAL =
+        getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_WINDOW_TYPE_NORMAL");
     _glfw.x11.NET_ACTIVE_WINDOW =
         getSupportedAtom(supportedAtoms, atomCount, "_NET_ACTIVE_WINDOW");
     _glfw.x11.NET_FRAME_EXTENTS =

src/x11_platform.h

@@ -170,6 +170,8 @@ typedef struct _GLFWlibraryX11
     Atom            NET_WM_ICON;
     Atom            NET_WM_PID;
     Atom            NET_WM_PING;
+    Atom            NET_WM_WINDOW_TYPE;
+    Atom            NET_WM_WINDOW_TYPE_NORMAL;
     Atom            NET_WM_STATE;
     Atom            NET_WM_STATE_ABOVE;
     Atom            NET_WM_STATE_FULLSCREEN;

src/x11_window.c

@@ -411,6 +411,14 @@ static GLFWbool createWindow(_GLFWwindow* window,
                         (unsigned char*) &pid, 1);
     }
 
+    if (_glfw.x11.NET_WM_WINDOW_TYPE && _glfw.x11.NET_WM_WINDOW_TYPE_NORMAL)
+    {
+        Atom type = _glfw.x11.NET_WM_WINDOW_TYPE_NORMAL;
+        XChangeProperty(_glfw.x11.display,  window->x11.handle,
+                        _glfw.x11.NET_WM_WINDOW_TYPE, XA_ATOM, 32,
+                        PropModeReplace, (unsigned char*) &type, 1);
+    }
+
     // Set ICCCM WM_HINTS property
     {
         XWMHints* hints = XAllocWMHints();