From kde-frameworks-devel  Fri Feb 01 12:12:54 2013
From: Martin =?ISO-8859-1?Q?Gr=E4=DFlin?= <mgraesslin () kde ! org>
Date: Fri, 01 Feb 2013 12:12:54 +0000
To: kde-frameworks-devel
Subject: KJavaAppletWidget's usage of KWindowSystem
Message-Id: <1478103.snYM6c1i5s () martin-desktop>
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Hi all,

I have sent this mail to kfm-devel some time ago, but have not received=
 any=20
reply so far. Therefore I try on frameworks-devel as it affects framewo=
rks.

The class KJavaAppletWidget is using the method KWindowSystem::doNotMan=
age()=20
to tell KWin (via DBus) to not manage the applet window.

The method in question is used only by KStart and by the java applet an=
d to be=20
honest: I would like to get rid off it in Frameworks 5.

Through lots of git magic I was able to find the commit which added the=
=20
functionality: kdelibs, 0838ff87 on 15th of July, 2000 by Matthias Ettr=
ich=20
with the very explaining commit message "do not manage magic". It doesn=
't help=20
me to understand why it is needed :-) The KWin part clearly states that=
 it is=20
a HACK only for Java applets.

From my understanding the method is wrong in general for the following=20=

reasons:
* works only with KWin
* uses D-Bus instead of X11
* if a window should not be managed by the window manager it should use=
 the=20
override redirect hint
* matching windows by title is broken by design
* adds a hack to a window manager to work around a Client (not good)

For me the important question is, whether this is still needed. And tha=
t is=20
what I cannot test, as:
* I don't know of any web page still using Java Applets
* I have uninstalled Java after one of the recent security nightmares
* I don't want to install Java again due to the security issues

If anyone could enlighten me, I would be very happy :-)

If this functionality is no longer required, I would prepare a commit f=
or=20
frameworks 5 to remove it from KDE Frameworks 5 and mark the methods in=
 KWin=20
for removal. For KDE 4 life time we will keep the interface there, thou=
gh I=20
honestly don't know whether it's still functional ;-)

If it is still required, I would like to discuss what could be done to =
not=20
need it. Apparently other window managers don't provide the KWin D-Bus=20=

interface and apparently other browser engines don't need to tell KWin =
about=20
it. So there must be solutions which would not need this method.

Unrelated side-note: the code in KJavaAppletWidget is partially disable=
d in=20
the frameworks branch.

Best Regards
Martin Gr=C3=A4=C3=9Flin
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