message threading bugs

Wayne Mery (Thunderbird QA) vseerror at Lehigh.EDU
Sun Sep 21 19:41:00 UTC 2014

I've just done a major tidy up of message threading bug reports and 
what's left is roughly 50 bugs [1]. Many of these are old, longstanding, 
annoying. :)  I hope some people can take this to the next level and 
tidy the list up further, and fix one or two.

[1] contains some testcases, some unconfirmed, some outliers, etc. but 
on the whole I suspect there's fewer than 10 different causes behind the 
scenes.  (excluding mostly ENH requests of meta bug and virtual/unified 
folder issues which are troublesome but not of so much interest in the 
context of this posting)

Some notable reports:
Bug 638773 - Fake headers (for messages I just sent) are improperly threaded
Bug 719748 - Message view and thread pane easily get out of sync
Bug 812745 - Incorrect threading in the message pane after a move

An example outlier is Bug 876279 - Threaded mail view rendering 
incorrect when expanding threads, until mouseover (linux). Driver?

[1] aka

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