Publish 0.6.4

ICCCM 4.1.2.5 (https://tronche.com/gui/x/icccm/sec-4.html#WM_CLASS)
states that:

> This property must be present when the window leaves the Withdrawn
> state and may be changed only while the window is in the Withdrawn
> state.

Previously, we would first map the window, and then set these
properties, causing sadness for window managers (#167,
tomaka/glutin#879). This patch changes that by setting the class and
name attributes immediately after the window is created, and before it
is mapped.

Fixes #167.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "winit"
-version = "0.6.3"
+version = "0.6.4"
 authors = ["The winit contributors, Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform window creation library."
 keywords = ["windowing"]

src/platform/linux/x11/window.rs

@@ -403,6 +403,19 @@ impl Window {
             win
         };
 
+        // Set ICCCM WM_CLASS property based on initial window title
+        // Must be done *before* mapping the window by ICCCM 4.1.2.5
+        unsafe {
+            with_c_str(&*window_attrs.title, |c_name| {
+                let hint = (display.xlib.XAllocClassHint)();
+                (*hint).res_name = c_name as *mut libc::c_char;
+                (*hint).res_class = c_name as *mut libc::c_char;
+                (display.xlib.XSetClassHint)(display.display, window, hint);
+                display.check_errors().expect("Failed to call XSetClassHint");
+                (display.xlib.XFree)(hint as *mut _);
+            });
+        }
+
         // set visibility
         if window_attrs.visible {
             unsafe {
@@ -466,18 +479,6 @@ impl Window {
             }
         }
 
-        // Set ICCCM WM_CLASS property based on initial window title
-        unsafe {
-            with_c_str(&*window_attrs.title, |c_name| {
-                let hint = (display.xlib.XAllocClassHint)();
-                (*hint).res_name = c_name as *mut libc::c_char;
-                (*hint).res_class = c_name as *mut libc::c_char;
-                (display.xlib.XSetClassHint)(display.display, window, hint);
-                display.check_errors().expect("Failed to call XSetClassHint");
-                (display.xlib.XFree)(hint as *mut _);
-            });
-        }
-
         let is_fullscreen = window_attrs.monitor.is_some();
 
         if is_fullscreen {