* Compatibility with TB 150
* Revamp of the Originals folders mechanism. Most importantly: The Originals and search folders may now safely overlap, with a well-defined result; dupe sets only containing messages from Originals folders will be ignored, not deleted.
* When deciding which folders to search, now properly accounting for the selected folders and the active folders (e.g. when right-clicking it).
*: Fixed a bug preventing searching special folders for dupes even when such searches are enabled by the extension preferences.
* Now clearly reporting the situation of there not being any valid folders selected for a search (where before, the extension would have presented the wrong error message).
* Duplicate search no longer fails automatically when multiple folders are searched.
* Dupe review dialog tree widget - restored proper chrome for column header row, including a mini-button for picking which columns are visible.
See also links to the individual issues here:
https://github.com/eyalroz/removedupes/releases/tag/v0.6.6