Bug#768542: libgtk-3-0: no borders in windows that are "split on left/right"

[Todor Tsankov]

Package: libgtk-3-0
Version: 3.14.4-1
Severity: normal

Dear Maintainer,

The new GTK3 theme does not display borders on "half-maximized" windows
which leads to a rather strange look. To reproduce (using gnome-shell),
do the following:

-- start a copy of gedit; press <super>-<left> to maximize to the
left half of the screen.

-- start another copy of gedit; press <super>-<right> to maximize to the
right half of the screen.

Result: there is no border between the two windows and it is impossible
to visually distinguish where one window ends and the other starts. This
seems to be a problem in the new theme and a regression from 3.12.


-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libgtk-3-0 depends on:
ii  libatk-bridge2.0-0   2.14.0-2
ii  libatk1.0-0          2.14.0-1
ii  libc6                2.19-12
ii  libcairo-gobject2    1.14.0-2.1
ii  libcairo2            1.14.0-2.1
ii  libcolord2           1.2.1-1+b1
ii  libcups2             1.7.5-7
ii  libfontconfig1       2.11.0-6.1
ii  libfreetype6         2.5.2-2
ii  libgdk-pixbuf2.0-0   2.31.1-2+b1
ii  libglib2.0-0         2.42.0-2
ii  libgtk-3-common      3.14.4-1
ii  libjson-glib-1.0-0   1.0.2-1
ii  libpango-1.0-0       1.36.8-2
ii  libpangocairo-1.0-0  1.36.8-2
ii  libpangoft2-1.0-0    1.36.8-2
ii  librest-0.7-0        0.7.92-2
ii  libsoup2.4-1         2.48.0-1
ii  libwayland-client0   1.6.0-2
ii  libwayland-cursor0   1.6.0-2
ii  libx11-6             2:1.6.2-3
ii  libxcomposite1       1:0.4.4-1
ii  libxcursor1          1:1.1.14-1
ii  libxdamage1          1:1.1.4-2
ii  libxext6             2:1.3.3-1
ii  libxfixes3           1:5.0.1-2
ii  libxi6               2:1.7.4-1
ii  libxinerama1         2:1.1.3-1
ii  libxkbcommon0        0.4.3-2
ii  libxml2              2.9.1+dfsg1-4
ii  libxrandr2           2:1.4.2-1
ii  multiarch-support    2.19-12
ii  shared-mime-info     1.3-1

Versions of packages libgtk-3-0 recommends:
ii  hicolor-icon-theme  0.13-1
ii  libgtk-3-bin        3.14.4-1

Versions of packages libgtk-3-0 suggests:
ii  gvfs             1.22.1-1
ii  librsvg2-common  2.40.5-1

-- no debconf information