- added destroyed? component to the window-type for a better

recognition of window-destroyal. (should be done with all types)

scheme/xlib/window-type.scm

@@ -1,10 +1,11 @@
 ;; the window-datatype ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (define-record-type window :window
-  (really-make-window tag Xwindow display) 
+  (really-make-window tag Xwindow display destroyed?) 
   window? 
   (tag window-tag window-set-tag!)
   (Xwindow real-window-Xwindow window-set-Xwindow!)
+  (destroyed? window-destroyed? window-set-destroyed?!)
   (display window-display window-set-display!))
 
 (define (window-Xwindow window)
@@ -22,7 +23,7 @@
   (let ((maybe-window (window-list-find Xwindow)))
     (if maybe-window
 	maybe-window
-	(let ((window (really-make-window #f Xwindow display)))
+	(let ((window (really-make-window #f Xwindow display #f)))
 	  (if finalize?
 	      (add-finalizer! window destroy-window)
 	      (add-finalizer! window window-list-delete!))
@@ -57,11 +58,10 @@
 (define (destroy-window window)
   (let ((Xdisplay (display-Xdisplay (window-display window)))
 	(Xwindow (window-Xwindow window)))
-    (if (integer? Xwindow)
-	(begin
     (window-list-delete! window)
-	  (%destroy-window Xdisplay Xwindow)
-	  (window-set-Xwindow! window 'already-destroyed)))))
+    (if (not (window-destroyed? window))
+	(%destroy-window Xdisplay Xwindow))
+    (window-set-destroyed?! window #t)))
 
 (import-lambda-definition %destroy-window (Xdisplay Xwindow)
   "scx_Destroy_Window")