[pkg-gnupg-maint] Bug#831626: pinentry-gtk2 locks Xfce4 with Alt-Tab

[Alain]

Package: pinentry-gtk2
Version: 0.9.7-5~bpo8+1
Severity: important

Dear Maintainer,

First, prepare an encrypted file with gpg that I call myfile.gpg.
To reproduce this bug, I do :
1. Open two windows of xfce4-terminal
2. Type F11 to put one terminal in full screen.
3. Alt-Tab to return in the other terminal.
4. Run : gpg -d myfile.gpg
5. pinentry is launched automatically.
6. Type Alt-Tab to return on the other terminal.
Now it is impossible to launch any command or to select another window.
X is locked.

Only a "kill -9" from a non-graphic console is possible and after that,
Alt-Tab or F11 is possible again.

I think that Alt-Tab should be forbidden when pinentry-gtk2 is displayed.

-- System Information:
Debian Release: 8.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 4.6.0-0.bpo.1-686-pae (SMP w/2 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages pinentry-gtk2 depends on:
ii  libassuan0     2.1.2-2
ii  libc6          2.19-18+deb8u4
ii  libglib2.0-0   2.48.0-1~bpo8+1
ii  libgpg-error0  1.17-3
ii  libgtk2.0-0    2.24.25-3+deb8u1
ii  libncursesw5   5.9+20140913-1+b1
ii  libsecret-1-0  0.18-1+b1
ii  libtinfo5      5.9+20140913-1+b1

pinentry-gtk2 recommends no packages.

Versions of packages pinentry-gtk2 suggests:
pn  pinentry-doc  <none>

-- no debconf information