I found feature requests for Skip All Identical in various places in the forum.
This request was frequently respondend by:
...or similar.
However, like some of the users in the other threads, I cannot confirm this. For me, only the current identical file is skipped, and with the next file, the prompt about what to do comes up again:
...was I about to write, and then double-checked again.
I just found that in fact, "Skip Identical" does a "Skip All Identical" on any current file queue – however, with one exception:
When copying or moving several files from a flat view to a folder where several of the source files are already present, "Skip Identical" skips only one of the source files, and the next file brings up the above dialog prompt again.
I believe this is a small bug that should still be fixed.