xerror: Print numeric infos about the error

xcb_event_get_{request,error}_label() return NULL for non-core requests and
error codes. Obviously, that's not really helpful at all, so also print the
numeric information about what failed.

Signed-off-by: Uli Schlachter <psychon@znc.in>

event.c

@@ -733,9 +733,11 @@ xerror(xcb_generic_error_t *e)
            && e->major_code == XCB_CONFIGURE_WINDOW))
         return;
 
-    warn("X error: request=%s, error=%s",
+    warn("X error: request=%s (major %d, minor %d), error=%s (%d)",
          xcb_event_get_request_label(e->major_code),
-         xcb_event_get_error_label(e->error_code));
+         e->major_code, e->minor_code,
+         xcb_event_get_error_label(e->error_code),
+         e->error_code);
 
     return;
 }