1. How can I avoid this seemingly inefficient behavior? How can I keep it from reiterating over all rows again, if I add more items to the selection?
Looks like I'm the only one who's bothered by this. Okay, look again:
Consider a TreeView with 1000 entries. Now select the first entry, hold shift and press the down-key to expand the selection downwards till you reach the bottom.
After hitting 'down' for the n-th time, the signal handler has been called (n * (n+1)) / 2 times (1 + 2 + 3 + ... + n). That means, after selecting 1000 entries this way, the signal handler has been called (1000 * 1001)/2 times, that is 500500 times. In words: Over half a /million/ times!
I really hope I am missing something.
-- Matthias Kaeppler
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