1

When using Image -> Mirror, the superimposed image could be mirrorred as well.

2

Hi,
It should work… if you have video A and B, you have mirrored B and you have superposition active, Image B should be mirrored when seen on top of A. A will not be mirrored. Forcing A to be mirrored is not desirable in my opinion because a very common scenario is to compare two videos filmed from a different side (or two high jumpers with different takeoff foot for instance), and mirroring only one video so they are comparable. You can always explicitly mirror both videos if need be.

However I see there are bugs when moving the image around…