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In 10.1.7 grey items when vendored are now automatically added into the transmog tab so there is no concern that one might sell an unlearned appearance. This is especially annoying when doing older content which have a load of different grey BoE items.

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Either re-add all BoE grey items into the default "marked for junk" list, or a button which enables you to turn it on (I understand there may be people who wish not to autosell grey items due to being able to sell them on the AH but I find the change of making all grey BoEs having to be marked annoying)

Or move the Scrap button so it isn't directly over Blizzard's own "sell junk" button, so that I can click Scrap to deal with all the epics then click Blizzard's to deal with all grey BoEs.

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I would use the default Blizzard "sell junk" button but the button for Scrap seems to be directly over that in the interface so I cannot click "sell junk" via Scrap, then "sell junk" via Blizzard's default UI to circumvent the issue.

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In 10.1.7 grey items when vendored are now automatically added into the transmog tab so there is no concern that one might sell an unlearned appearance.

This is only true for grey items your current character can learn. For example, if you're on a plate toon, and you vendor a BOE gray mail item, you will not learn that appearance.