Frame position when seeking past the end of file #1282
Merged
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When some formats seek to a non-existent frame and raise EOFError, tell() then reports the non-existent frame position.
A side effect of this is n_frames reporting an incorrect value.
I've added tests for other formats, except for SPIDER. This is because the test file matches the condition
self.istack == 0
on this line which means that seek has no effect.