Changeset [db3514a2c1c9bccf4527a26acad9c5be82071a2f] by Alexander Ljungberg

Only allow a single window frame animation at a time; stop the previous animation before starting a new one. This allows e.g. a sheet animating open to 'turn around' and animate right back out. Fixed: if a sheet was closed before it finished animating open, for example by hitting a keyboard equivalent immediately, CPWindow would crash with "Uncaught TypeError: Cannot read property 'sheet' of null".
http://github.com/280north/cappuccino/commit/db3514a2c1c9bccf4527a2...