Decided to unconditionally redraw everything on a window resize on Mac OS X. Now to add TODOs for the other platforms to see if we should do the same.

delegate_darwin.go

@@ -41,7 +41,7 @@ func appDelegate_windowDidResize(win C.id) {
 	r := C.frame(wincv)
 	// winheight is used here because (0,0) is the bottom-left corner, not the top-left corner
 	s.doResize(0, 0, int(r.width), int(r.height), int(r.height))
-	C.display(win)			// redraw everything; TODO only if resize() was called?
+	C.display(win)			// redraw everything
 }
 
 //export appDelegate_buttonClicked