new: support for releasedWhenClosed in CPWindow

AppKit/CPView.j

@@ -44,6 +44,7 @@
 @class CPClipView
 @class CPScrollView
 @class CALayer
+@class CPBinder
 
 @global appkit_tag_dom_elements
 
@@ -3732,6 +3733,16 @@ var CPAppearanceVibrantDark = [CPAppearance appearanceNamed:CPAppearanceNameVibr
         [owners[i] updateTrackingAreas];
 }
 
+// needed by CPWindow's releasedWhenClosed property
+- (void)_releaseRecursively
+{
+    [_subviews makeObjectsPerformSelector:@selector(_releaseRecursively)];
+
+    [self _removeObservers];
+    [CPBinder unbindAllForObject:self];
+    [self removeFromSuperview];
+}
+
 @end
 
 var CPViewAutoresizingMaskKey       = @"CPViewAutoresizingMask",

AppKit/CPWindow/CPWindow.j

@@ -186,6 +186,7 @@ var CPWindowActionMessageKeys = [
     BOOL                                _constrainsToUsableScreen;
     unsigned                            _shadowStyle;
     BOOL                                _showsResizeIndicator;
+    BOOL                                _releasedWhenClosed @accessors(property=releasedWhenClosed);
 
     int                                 _positioningMask;
     CGRect                              _positioningScreenRect;
@@ -2534,6 +2535,9 @@ CPTexturedBackgroundWindowMask
     [_parentWindow removeChildWindow:self];
     [self _orderOutRecursively:NO];
     [self _detachFromChildrenClosing:!_parentWindow];
+
+    if (_releasedWhenClosed)
+        [_contentView _releaseRecursively];
 }
 
 - (void)_detachFromChildrenClosing:(BOOL)shouldCloseChildren