When starting DeSmuME with HD prescaling set to 2 or higher, the image appears horizontally squashed a little. I can work around this by entering/exiting fullscreen.
See attached image. Left is after starting DeSmuME with HD prescaling set to 2, and right is after entering/exiting fullscreen.
Anonymous
Just to add, this happens with all renderers and display methods.
It's actually the gap size messing it up
fixed in r5278