How is the existing tree populated - by scanning packages for .tpp files ?
Yes.
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Is "theIDE help" a hard coded top level topic? Auto-updating of the help index is a feature worth keeping of course.
Yes, it is included in .exe (so it is there even if ide package is not present).
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I'm not familiar with using svn with U++. Topic++ files are binary aren't they.
Not anymore, that was part of creating new infrastructure. Diff would work with them just OK (but of course, you would have to deal with raw QTF to solve conflicts - nothing too hard anyway).
I believe that current documentation infrastructure, while not perfect, is good enough. What is missing is content