Message 45782 - Python tracker

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I improved the algorithm for finding the context lines, so
it now scans the minimum number of lines it needs in order
to update the panel - it uses the information it already has
in a better way. This makes the scrolling of long modules
more "streaming", on my not-that-new computer.
I tried it, and it seems to work just as good as the old
algorithm - it produces the same results.