Comment 3 for bug 1261351

The solution currently proposed in bug 678345 seems targeted at a different case, where an attachment filename conflicts with pre-existing files in the destination folder. "Skip" would be what you want in the case of "I know you've been working on these files, but I forgot to send you all of them". And "Replace" would be what you want in the case of "I didn't send you all the files last time, here's an updated set".

But that would not fix this bug. Whether the default button was "Skip" or "Replace", the default behavior for same-named attachments would *still* be for only one of the attachments to be saved! "Skip" would save only the first one, and "Replace" would save only the last one. And if "Rename" was the default button, that would again nearly defeat the purpose of "Save All", not to mention being on the wrong side of the dialog.

It's possible for the two cases to happen simultaneously -- for some attachments to have the same filename, while either those or others have the same filenames as pre-existing files in the destination folder. For example, someone on an iOS device might mail you several "image.jpeg" photos in one message, then several more "image.jpeg" photos in a second message, which you save in the same folder.

Therefore, the cases can't (or at least shouldn't) be handled with separate dialogs. Nonetheless, I think the solutions are different. The solution for pre-existing files is the dialog, because their filenames may be important to preserve. But the solution for same-named attachments is just to choose a unique name automatically, no questions asked. Having the same name means that the filenames were not important (or that the paths need changing post-save anyway), so there is no point in asking before choosing a unique name.