Bug#810947: kwin-x11: iceweasel locks up when multiple windows restored

[Arthur Marsh <arthur.marsh@internode.on.net>]

Package: kwin-x11
Version: 4:5.4.3-1.1
Followup-For: Bug #810947

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

I've commented out oldstable from /etc/apt/sources.list, purged most of the 
packages now listed as obsolete and re-run things with a stock Debian kernel
and am still seeing the same things ie iceweasel locks up when attempting to
restore several windows when starting from the start menu (and this time it
did the same starting from krunner).

If I kill -9 the kwin_x11 process that is the child of the process with the 
command line /usr/bin/kwin_x11 --crashes 1 the iceweasel process continues
and everything loads normally (the /usr/bin/kwin_x11 process continues to 
run and I get the tops of windows still showing).

I'll do a check of starting iceweasel from xfce just to make sure that
still works.

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-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.4.0-rc8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: sysvinit (via /sbin/init)

Versions of packages kwin-x11 depends on:
ii  kwin-common          4:5.4.3-1.1
ii  libc6                2.21-6
ii  libkf5i18n5          5.16.0-1
ii  libkf5windowsystem5  5.16.0-1
ii  libqt5core5a         5.5.1+dfsg-12
ii  libqt5gui5           5.5.1+dfsg-12
ii  libqt5widgets5       5.5.1+dfsg-12
ii  libqt5x11extras5     5.5.1-3
ii  libstdc++6           5.3.1-5
ii  libxcb1              1.11.1-1

kwin-x11 recommends no packages.

kwin-x11 suggests no packages.

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