OS X window changes:

- clear window to black when going in/out of fullscreen. this remotes
the "animated" flag but all that seemed to do was cause a white flash
- center the window using [NSWindow center] instead of calculated
position. This centers it more accurately and matches the position
when going out of FULLSCREEN_WINDOW mode.

Author: Trent Gamblin

src/macosx/osxgl.m

@@ -267,8 +267,7 @@ +(void) set_frame : (NSValue *) param {
    NSRect *rc = [[array objectAtIndex:0] pointerValue];
    NSWindow *win = [[array objectAtIndex:1] pointerValue];
 
-   // Couldn't resist animating it!
-   [win setFrame:*rc display:YES animate:YES];
+   [win setFrame:*rc display:YES animate:NO];
 }
 @end
 
@@ -1033,14 +1032,7 @@ +(void) initialiseDisplay: (NSValue*) display_object {
       [win setFrameOrigin: origin];
    }
    else {
-      /* Center the window */
-      NSRect rc = [win frame];
-      NSRect sc = [[win screen] frame];
-      NSPoint origin;
-
-      origin.x = sc.origin.x + sc.size.width/2 - rc.size.width/2;
-      origin.y = sc.origin.y + sc.size.height/2 - rc.size.height/2;
-      [win setFrameOrigin: origin];
+      [win center];
    }
    [win makeKeyAndOrderFront:self];
    if (mask != NSBorderlessWindowMask) [win makeMainWindow];
@@ -1974,6 +1966,9 @@ static bool resize_display_win(ALLEGRO_DISPLAY *d, int w, int h)
                                   waitUntilDone: YES];
 
    [pool drain];
+
+   clear_to_black(dpy->ctx);
+
    return acknowledge_resize_display_win(d);
 }