Review Request 119062: Add a script to enforce window decorations for GTK windows

[Martin Gräßlin]

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https://git.reviewboard.kde.org/r/119062/
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Review request for kwin and Plasma.


Repository: kwin


Description
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Add a script to enforce window decorations for GTK windows

This is going to be a controversal change. It enforces KWin decorations
on all client side decorated windows from GTK+. Unfortunately we are
caught between a rock and a hard place. Keeping the status quo means
having broken windows and a more or less broken window manager due to
GTK+ including the shadow in the windows. This is no solution.
Enforcing server side decorations visually breaks the windows. This is
also no solution. So why do it?

It's our task to provide the best possible user experience and KWin is
a window manager which has always done great efforts to fix misbehaving
windows. One can think of the focus stealing prevention, the window rules
and lately the scripts. The best possible window management experience is
our aim. This means we cannot leave the users with the broken windows
from GTK.

The issues we noticed were reported to GTK+ about 2 months ago and we are
working on improving the situation. Unfortunately several issues are not
yet addressed and others will only be addressed in the next GTK+ release.
We are working on improving the NETWM spec (see [1]) to ensure that the
client side decorated windows are not in a broken state. This means the
enforcment is a temporary solution and will be re-evaluated with the next
GTK release. I would prefer to not have to do such a change, if some of
the bugs were fixed or GTK+ would not use client-side-decos on wms not
yet supporting those all of this would be a no issue.

For a complete list of the problems caused by GTK's decos see bug [2] and
the linked bug reports from there.

The change is done in a least inversive way in KWin. We just check for
the property _GTK_FRAME_EXTENTS and create a Q_PROPERTY in Client for it.
If we add support for the frame extents in future we would also need
this. So it's not a change just for enforcing the decoration.

The actual enforcing is done through a KWin script so users can still
disable it.

[1] https://mail.gnome.org/archives/wm-spec-list/2014-June/msg00002.html
[2] https://bugzilla.gnome.org/show_bug.cgi?id=729721


Diffs
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  atoms.h d52223504a78909efa7c18d7e96feebec8f3cb21 
  atoms.cpp 576e85f0c0e865721a1b513af9d1ad1bfdb580ea 
  client.h 8e41e203d01b41fdd918c35fb3dc9353d7e41774 
  client.cpp 608e6a8435ad9bc7d86ff813038023648e6b7b1e 
  events.cpp 514eecc69d81136d8975155e0fbb3fef39d3a346 
  manage.cpp fbdf19570418e412cdadb54f36cf94e5da24db4f 
  scripts/CMakeLists.txt feeb288250407f5f2bd4b3ea878f21640ebb7d20 
  scripts/enforcedeco/contents/code/main.js PRE-CREATION 
  scripts/enforcedeco/metadata.desktop PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/119062/diff/


Testing
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Thanks,

Martin Gräßlin

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