When copy all filters from one account to another account, the filters in the
target account are reverse order.
Eg.
If the filters in the source account are ordered 1 2 3,
They get pasted into the new account top down as 3 2 1.

quickFilters-2.9

I have just reproduced the behavior. We also need to test if this happens when
we stay on the same account.

Created an attachment (id=8126) [details]
quickFilters 3.0 Prerelease 25

Here is a version with a quick fix. Apparently the bug also happens when
copying or moving (cut/paste) within the same mail account.

It's fixed with a but.
If you have filters 1 2 3 in one account and you left click to select 1 and
then shift left click 3 to select them all they can be copied and pasted in
order to another account.

If you have filters 1 2 3 in one account and you left click to select 3 and
then shift left click 1 to select them all they can be copied and pasted to
another account but the order is 3 1 2

Created an attachment (id=8127) [details]
quickFilters 3.0 Prerelease 40

Good catch about the wrong order. This version addresses the problem by
re-sorting the selection in the order of execution; this should even work when
you make multiple selections using combined SHIFT and CTRL selections. 

This will also work when you select multiple filters and move them to a
different position in the list using Cut+Paste.

Remember to select the position of another filter as "position target" - the
selected filters will be inserted before this one (this can also be used as a
"defragmentation tool" = pulling filters together. Tested in Thunderbird 42.0

All fixed.