On TW snapshot 20170517 we see a strange situation on yast[1], while send
'down' key to 'x pattern', after press 'down' after 'font pattern'(x pattern is
the next one) the list page is scroll up, the reason is 'Primary Functions' and
'Kubic Stack' entries suddenly appears on the top side. Dig into this issue I
see weird behavior below:

1) at the beginning 'Primary Functions' and 'Kubic Stack' does not appear while
scroll down the list to the bottom side, however after that, move to the top
side these two entries appears at the top side.

2) press 'end' move the focus to the bottom side, and start repeating send 'up'
key, till the focus was on the 'Server Functions' then press 'up' key again the
next one is 'Kubic Stack'[2], and send 'up' key again the focus is lost[3],
keep sending 'up' key the scroll bar does not change, now drag the scroll bar
to the top side, I see 'Primary Functions' and 'Kubic Stack' is there, and the
focus is on the 'Primary Functions' entry.

issues lead us so confused the ordering of entries(and timing to resort
entries) and pattern's visible/invisible, and thought that entry appeared
suddenly at some point is a real bug.

Note that, this issue now we only seen on NET install due to many patterns is
only available from net install, tro to reproduce this issue from net iso[5]
you have to set Server: openqa.opensuse.org and Directory:
/assets/repo/openSUSE-Tumbleweed-oss-i586-x86_64-Snapshot20170517 from testing
HEAD due to it's not published yet to download.o.o.

[1] https://openqa.opensuse.org/tests/405554#step/installer_desktopselection/39
[2] http://susepaste.org/82684928
[3] http://susepaste.org/20244118
[4] http://susepaste.org/76581180
[5]
https://openqa.opensuse.org/tests/405554/asset/iso/openSUSE-Tumbleweed-NET-x86_64-Snapshot20170517-Media.iso