Subject threading bug - 'missing

[Uday Reddy]

When there is a tree of messages as follows:

  917+2
     918
     919

and 917 is expunged, then 918 becomes the subject root of the remainder of the thread. However, its subtree doesn't contain 919. It seems that it hasn't been recognized that 918 has become a subject root, and all its data updated accordingly.

[Uday Reddy (reddyuday)]

Another potential problem seems to be this. Given a subject thread like

    917+2 Subject
       918 Subject
       919 Re: Subject

where 919's reference parent is 917, expunging 917 causes it to be removed from the subject thread. This makes 919 dangling. Even though 919 records 918 as its root, 918 doesn't record 919 as a descendant.

[Uday Reddy (reddyuday)]

These problems are fixed in revision 894 of the 8.2.x branch.

However, there are still other errors giving 'spurious messages in integrity check.

Subject threading is more complicated than it first appeared. It seems better to use the Jamie Zawinski idea of ghost messages as the roots of reference threads.

[Uday Reddy (reddyuday)]

Ghost roots are now implemented in revision 1239 of the trunk.