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Back from slide B to slide A played A's own entrance transition. PowerPoint plays the transition B came in with, backwards. ShowState now remembers that the current slide was reached by Back (`backward`, set by `prev`, cleared by every other way in). The show then takes the transition of the slide it left and runs its frames from the end to the start, with the old and new slides trading places (`transition_layers`). Morph needs no reversing: a Morph from the slide left to the one come back to already is the reversed Morph. A jump (Go to Slide, links, See All Slides) still plays the target slide's transition. Co-Authored-By: Claude <noreply@anthropic.com>