Shredder 3.0b1pre 2008-10-21 / Windows Vista This bug is a combination of a real bug and a RFC. Maybe the bug/broken feature is a result of moving "Open messages in:" from Tools>Options>Advanced>General to Tools>Options>Advanced>Read & Display. In latest Nightly Shredder builds double clicking a message in thread pane opens this message everytimes in a new message window. The above mentioned option (to open messages in the existing window) seems not to be honored. Some times ago, the following string has beend added to messenger/preferences/advanced.dtd: <!ENTITY reuseExpRadio2.label "A new message tab"> So IMHO we should fix this bug and implement now the RFE to open messages in a new tab.
Well I thought when I first tried it that I could reproduce this problem, but now I can't. This doesn't block bug 456814 - they aren't related. Please file a new enhancement bug for the open new message in a tab preference (which could be marked as blocking bug 218999), because we keep to one issue in a bug so that issues don't get lost.
I can reproduce this bug in Shredder 3.0a3 with a clean new profile, too.
Alexander, do you see this problem using a nightly build? ftp://ftp.mozilla.org/pub/thunderbird/nightly/latest-trunk/ Note: this bug is from litmus testing https://litmus.mozilla.org/single_result.cgi?id=158991
... if this works for you using nightly build or soon to be issued 3.0b1, please change status to resolved and resolution to worksforme. WFM Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b3pre) Gecko/20081201 Shredder/3.0b1pre
Works for me, using a Shredder 3.0b1pre nightly build 2008-11-28.