[Gnumed-devel] list sorting improvement

[Karsten Hilbert]

List sorting required to keep a copy of the list rows (not
the data, though) around for the sorter to use them for
sorting. To ease the memory pressure I have slightly
optimized this: Whenever the list is updated with data the
copy of rows is thrown away. It is only reconstructed when
someone actually requests the list being sorted by a column.
Then, that copy is kept for re-use in sorting until the list
content is updated again.

I guess that gives us the best of both worlds, low memory
footprint even with large lists vs sortability.

Karsten
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