Urxvt tabbed(ex) scroll doesn't work when mouse is not inside urxvt window

[Vas No Medas]

Hello!

I have awesome WM and urxvt v9.19 with tabbed plugin enabled. Also I scroll
with Shift+Up/Down. When I switch focus to my urxvt terminal but leave
mouse outside, Shift+Up/Down has no effect. However, if I move the mouse
in, scrolling works just right.

Also when I disable tabbed plugin, scrolling works in all cases. I've tried
tabbedex, but the situation is still the same.

I've found a similar bugreport
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511377 which says that
this was fixed in 9.14-15
The solution there was to add on_tt_write handler. My perl/tabbed file also
has on_tt_write handler but it seems that it is never called (tried putting
warn in it)

Here is my ~/.Xresources file: http://bpaste.net/show/AddbC9C0d9U7qovNAa0R/

Also would be great if you could tell if you were able to reproduce the bug
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