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Using version 45.4.0 on Windows Server 2012 R2. I was pretty sure there must already be a bug on this, but I have been unable to find it. Typically I have a few threads in my inbox which are collapsed, in particular the last one in the list. When I then read mail in other folders and come back to the inbox (without new/unread messages), often times the last thread is auto-expanded. It does not happen every time and I have not been able to identify a pattern when it would expand and when not. I any case it should always preserve if a thread was collapsed or expanded. I only recently migrated from SeaMonkey to Thunderbird. In SeaMonkey that worked perfectly. pi
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