OK, I'm one step further and found out which packages to downgrade to
prevent that strange frame/border around Gnome-windows-problem:

The following downgrades prevent the problem:
Downgrade of gtk3 (3.16.1-1 => 3.14.9-1)
Downgrade of nautilus (3.16.0-1 => 3.14.2-2)
Downgrade of totem (3.16.0-1 => 3.14.2-1)

I found it by downgrading Nautilus at first. The problem kept appearing, in
terminal was the message: (starting nautilus 3.16)

$ nautilus

(nautilus:3652): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:2:19:
Theming engine 'adwaita' not found

(nautilus:3652): Gtk-WARNING **: Failed to register client:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SessionManager was not provided by any .service files
Initializing nautilus-dropbox 2.10.0
<IntrospectionModule 'Nautilus' from
'/usr/lib/girepository-1.0/Nautilus-3.0.typelib'>
Insync Nautilus Plugin
<class 'insync_plugin.InsyncExtension'>
Socket: /run/user/1000/ownCloud/socket <=> /ownCloud/socket
Socket File: /run/user/1000/ownCloud/socket
Setting connected to True
Socket watch id: 16
('[__init__ insync plugin]', <InsyncExtension object at 0x7f349237bd70
(uninitialized at 0x0)>)
sys:1: Warning: The property GtkSettings:gtk-button-images is deprecated
and shouldn't be used anymore. It will be removed in a future version.
sys:1: Warning: The property GtkSettings:gtk-menu-images is deprecated and
shouldn't be used anymore. It will be removed in a future version.

That made me think of downgrading gtk, in which I was right and wrong at
the same time:
The frame-around-windows-problem disappeared, but the waring starting
nautilus stayed:
starting nautilus 3.14:

$ nautilus

(nautilus:5174): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:2:19:
Theming engine 'adwaita' not found

(nautilus:5174): Gtk-WARNING **: Failed to register client:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SessionManager was not provided by any .service files
Initializing nautilus-dropbox 2.10.0
ImportError: No module named Nautilus

(nautilus:5174): Nautilus-Python-WARNING **: nautilus_python_init_python
failed

(nautilus:5174): GLib-GObject-WARNING **: The property
GtkSettings:gtk-button-images is deprecated and shouldn't be used anymore.
It will be removed in a future version.

(nautilus:5174): GLib-GObject-WARNING **: The property
GtkSettings:gtk-menu-images is deprecated and shouldn't be used anymore. It
will be removed in a future version.


So thanks for your input!

2015-04-10 22:02 GMT+02:00 Bazon Bloch <bazonbl...@arcor.de>:

> I am using a Compositor. kwin includes one and when I use xfwm4 as a
> fallback, I enable the Compositor, too. (and other Compositor effects such
> as transparency and wobbly are working... )
>
> And this border hasn't been there with Gnome 3.14. + those other DEs /
> window managers.
>
> Maybe some aspect of foreign compositors working together with Gnome broke
> in 3.16?
> Am 10.04.2015 17:42 schrieb "Emmanuele Bassi" <eba...@gmail.com>:
>
>> Hi;
>>
>> On 10 April 2015 at 16:05, drago01 <drag...@gmail.com> wrote:
>> > On Fri, Apr 10, 2015 at 4:59 PM, Bazon Bloch <bazonbl...@arcor.de>
>> wrote:
>> >> With Gnome 3.16, applications like nautilus, totem, file-roller,
>> evince,
>> >> gnome-calculator and others in other desktop environments (XFCE, KDE)
>> have
>> >> an ugly frame around their windows now. It's probably a not working
>> shadow.
>> >> See e. g.  http://i.imgur.com/tNdVSI6.png
>> >> (Screenshot made with XFCE and kwin, but it happens with xfwm4, too.
>> >> GTK theme = Adwaita-Manjaro. With pure Adwaita, the frame is slightly
>> >> thinner and white, but still exists.)
>> >>
>> >> This is probably related to
>> >>
>> https://blogs.gnome.org/fmuellner/2015/01/30/a-small-note-on-window-decorations/
>> >
>> > No it isn't.
>> >
>> >> Does anyone know how to get rid of this frame in other DEs?
>> >
>> > This looks like it tryes to draw a shadow and fails to do so because
>> > you are not using a compositor.
>>
>> I don't think that's the case.
>>
>> > So file a bug against gtk.
>> > As a workaround enable the compositor provided by your DE.
>>
>> If no compositor is detected, GTK+ already draws a full border, no
>> rounded corners, and no shadow.
>>
>> See bug: https://bugzilla.gnome.org/show_bug.cgi?id=746222
>>
>> Ciao,
>>  Emmanuele.
>>
>> --
>> https://www.bassi.io
>> [@] ebassi [@gmail.com]
>>
>
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