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Project Hamster: fighting unlinked references that lead to memory leaks

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http://projecthamster.wordpress.com – I was hunting down a problem with hamster dialogs. The problem was quite annoying – you open, for example, the overview window. You pick a good range, like 2 years or so that will make it think for a while (oh wow, just checked – i have 6 years of datas now in my install). After that you close the window and would expect it to be gone for good (with all the window.destroy and everything). Turns out the window still is “somewhere out there” and whenever you make an update, that overview window, although not really accessible from the code anymore, is still listening to the events an (Software)