Annotation Previews – find combinable measures/zones

[nikobeer]

What do we have?

• 6 consecutive measures on the same source page as participants of an annotation with a line/system break after measure 3
• zone of measure 4 does not overlap with zone of measure 1 (because measure 1 is "more right" on the page than measure 4)
• but zones of measures 5 and 6 do overlap with the (above) measure zones prior to the line/system break (zones of measures 1 to 3)

What do we want?
Either:

• one calculated preview area from measure 1 to 6 (seems complicated to evaluate and calculate)
• two calculated preview areas – 1. from 1 to 3 and 2. from 4 to 6. (preferred)

What do we get?
Edirom or better getAnnotationPreviews.xql calculates two preview areas that contain redundant measures/zones:

1. M 1 to 3 + M 5 to 6
2. M 4 to 6

Where can we see this bug in action?
rwa_annot_28031 or better: ask @nikobeer because content is not publicly available yet.

Where does it happen in the code?
getAnnotationPreviews.xql functions local:getCombinations/local:compareZones

What could be a possible solution?
Maybe we should stop evaluation of combinations at position where local:compareZones returns "false" and start over by resetting position[where we stopped +1] to position[1] and shrink the amount of measures to compare ($total) to the amount of remaining measures after position[where we stopped + 1]?

Or: Further (re)evaluate if the resulting aggregated preview areas are overlapping and build an even bigger preview area and so on. Until there is one preview area left for each page…

@riedde and @bwbohl: I think that this is little bit serious, because it could lead to some irritating preview presentations…