FIX: Decrease figure refcount on close of a macosx figure

We need to take the refcount of the figuremanager down when we
close a window. This was leaking figures before.

Author: greglucas

src/_macosx.m

@@ -193,7 +193,6 @@ @interface Window : NSWindow
 - (Window*)initWithContentRect:(NSRect)rect styleMask:(unsigned int)mask backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation withManager: (PyObject*)theManager;
 - (NSRect)constrainFrameRect:(NSRect)rect toScreen:(NSScreen*)screen;
 - (BOOL)closeButtonPressed;
-- (void)dealloc;
 @end
 
 @interface View : NSView <NSWindowDelegate>
@@ -1239,19 +1238,9 @@ - (void)close
     /* This is needed for show(), which should exit from [NSApp run]
      * after all windows are closed.
      */
-}
-
-- (void)dealloc
-{
-    PyGILState_STATE gstate;
-    gstate = PyGILState_Ensure();
+    // For each new window, we have incremented the manager reference, so
+    // we need to bring that down during close and not just dealloc.
     Py_DECREF(manager);
-    PyGILState_Release(gstate);
-    /* The reference count of the view that was added as a subview to the
-     * content view of this window was increased during the call to addSubview,
-     * and is decreased during the call to [super dealloc].
-     */
-    [super dealloc];
 }
 @end