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[Jameson Graef Rollins]

Final v3 rework of this patch series:

* reworked pop-at-end patch to be much simpler (which also happens to
  get around other issues with this patch that dme had)
* added pop-at-end function to both show-next-...message functions
* fixed call to search-next-thread in show-next-thread function
* added patch at beginning to fix search thread navigation in show
  mode
* add patch at end to fix doc string
* Fix doc string

jamie.