Replaced repeat kluge with detectable auto repeat.

src/input.c

@@ -139,7 +139,9 @@ void _glfwInputKey(_GLFWwindow* window, int key, int action)
         window->key[key] = GLFW_STICK;
     else
     {
-        repeated = (window->key[key] == GLFW_PRESS) && (action == GLFW_PRESS);
+        if (action == GLFW_PRESS && window->key[key] == GLFW_PRESS)
+            repeated = GL_TRUE;
+
         window->key[key] = (char) action;
     }
 

src/x11_init.c

@@ -470,6 +470,8 @@ static void detectEWMH(void)
 
 static GLboolean initDisplay(void)
 {
+    Bool supported;
+
     _glfw.x11.display = XOpenDisplay(NULL);
     if (!_glfw.x11.display)
     {
@@ -528,6 +530,14 @@ static GLboolean initDisplay(void)
         return GL_FALSE;
     }
 
+    XkbSetDetectableAutoRepeat(_glfw.x11.display, True, &supported);
+    if (!supported)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "X11: Detectable key repeat is not available");
+        return GL_FALSE;
+    }
+
     // Update the key code LUT
     // FIXME: We should listen to XkbMapNotify events to track changes to
     // the keyboard mapping.

src/x11_window.c

@@ -498,32 +498,6 @@ static void processEvent(XEvent *event)
             if (window == NULL)
                 return;
 
-            // Do not report key releases for key repeats. For key repeats we
-            // will get KeyRelease/KeyPress pairs with similar or identical
-            // time stamps. User selected key repeat filtering is handled in
-            // _glfwInputKey/_glfwInputChar.
-            if (XEventsQueued(_glfw.x11.display, QueuedAfterReading))
-            {
-                XEvent nextEvent;
-                XPeekEvent(_glfw.x11.display, &nextEvent);
-
-                if (nextEvent.type == KeyPress &&
-                    nextEvent.xkey.window == event->xkey.window &&
-                    nextEvent.xkey.keycode == event->xkey.keycode)
-                {
-                    // This last check is a hack to work around key repeats
-                    // leaking through due to some sort of time drift
-                    // Toshiyuki Takahashi can press a button 16 times per
-                    // second so it's fairly safe to assume that no human is
-                    // pressing the key 50 times per second (value is ms)
-                    if ((nextEvent.xkey.time - event->xkey.time) < 20)
-                    {
-                        // Do not report anything for this event
-                        break;
-                    }
-                }
-            }
-
             _glfwInputKey(window, translateKey(event->xkey.keycode), GLFW_RELEASE);
             break;
         }