Attempt to write duplicate project Jar entry with eXpanded views of alignment

Open an alignment, make a new view, eXpand views - two AlignFrame windows with the same dataset and same title.
This results in an exception in Save Project - trying to write the Jar entry for the dataset twice with the same name.
No functional impact, as the save process just continues.

Similar errors are also occurring in (develop for 2.9) with the Jalview/Chimera/Varna viewer jar entries, where the cause is that the list of written viewIds is scoped to each AlignmentPanel rather than the whole desktop.