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[Adam Reichold <adamreichold@xxxxxxxxxxx>]

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Hello,

Something unpleasant happened: Someone testing the current trunk
revisions reported reproducible race conditions in the current
rendering code when prefetching is enabled. After some consideration,
I redid almost all threading involved and changed it to a more robust
signals-based design. (The alternative was to remove prefetching.)

This should improve the robustness of rendering resp. threading, but
this close to releasing version 0.3.2, I am very uncomfortable with
such a intrusive change. So if you have some spare time on your hands,
please test any version newer than trunk revision 476 concerning
rendering, prefetching and - connected to that - memory consumption.

Thank you for your help! Best regards, Adam.
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