Play movie: missing indication of checksum mismatch

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open Super Mario Bros. 3 (U) (PRG1) [!].nes .
2. Import and play http://tasvideos.org/1558M.html . Note it the movie was made 
on version PRG0.

What is the expected output? What do you see instead?
I expected some kind of indication that the checksum of the ROM and the 
checksum of the ROM used to make the movie do not match. Instead, there is 
nothing in the UI telling me that I am using the incorrect ROM.

I recorded and then played back a native Bizhawk movie in the same way and got 
the same result.

Please also include a warning dialog stating that I should expect desyncs, do I 
wish to continue [yes, no] when I click on the "Ok" button. Right now, it is 
possible to play a SMB3 movie on a SMB1 ROM.

What version of the product are you using? On what operating system?
r2164

Please provide any additional information below.

Original issue reported on code.google.com by stop.squark on 6 Apr 2012 at 9:10