Problem:
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On day X you have a long chat with somone, and can see the whole history.
The next day you come in, and the history is pane is completely empty.
The full history is stored in $HOME$/.IntelliJ6/system/talk – it hasn't been deleted.
Furthermore, searching for nothing counter-intuitively brings up the entire history (which could be a Gig after a few years).
Proposed Solution:
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Both Trillian (www.trillian.cc) and Yahoo Messenger have good UIs for searching and browsing past chat histories; IntelliJ should implement something like them.