Fix duplicate mailsync notifications

[friedev]

mailsync was giving me duplicate notifications because it would detect the same display twice. I manually ran the command used to get the displays, and found the following:

$ pgrep -a Xorg
387 /usr/lib/Xorg :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch

$ pgrep -a Xorg | grep -wo "[0-9]*:[0-9]\+"
:0
:0

To fix this, I just piped the output into uniq:

$ pgrep -a Xorg | grep -wo "[0-9]*:[0-9]\+" | uniq
:0

[PRESFIL]

uniq(1) says:

Note: 'uniq' does not detect repeated lines unless they are adjacent. You may want to sort the input first, or use 'sort -u' without 'uniq'.

If I were you, I would use sort -u, or are you sure that stdio of uniq is guaranteed sorted.

[friedev]

If I were you, I would use sort -u, or are you sure that stdio of uniq is guaranteed sorted.

I suppose it's theoretically not guaranteed that the duplicates are adjacent, so I agree that sort -u would be a more robust solution. And actually, it looks like that change already got merged over from Luke's Git server:
https://git.lukesmith.xyz/mutt-wizard/commit/b56686aae5721da0f26bfac28b97635a363896e7