window gently requests focus instead of stealing it

windowfocus.patch

diff --git a/src/SFML/Window/Unix/WindowImplX11.cpp b/src/SFML/Window/Unix/WindowImplX11.cpp
index 4add01b..4cc2e7e 100644
--- a/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -486,18 +486,18 @@ void WindowImplX11::setKeyRepeatEnabled(bool enabled)
 ////////////////////////////////////////////////////////////
 void WindowImplX11::requestFocus()
 {
-    // Check if window is viewable (not on other desktop, minimized, ...)
-    XWindowAttributes attributes;
-    if (XGetWindowAttributes(m_display, m_window, &attributes) == 0)
-        return; // error getting attribute
-
-    // Not viewable: Can't set focus
-    if (attributes.map_state != IsViewable)
-        return;
+    // Ensure WM hints exist
+    XWMHints* hints = XGetWMHints(m_display, m_window);
+    if (hints == NULL)
+        hints = XAllocWMHints();
 
-    // Bring window to the front and give it input focus
-    XRaiseWindow(m_display, m_window);
-    XSetInputFocus(m_display, m_window, RevertToPointerRoot, CurrentTime);
+    if (hints != NULL)
+    {
+        // Add Urgency Hint flag (visual notification)
+        hints->flags |= XUrgencyHint;
+        XSetWMHints(m_display, m_window, hints);
+        XFree(hints);
+	}
 }