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List: kde-panel-devel
Subject: Re: Review Request: Fix KWindowSystem::compositingChanged signal
From: "Xuetian Weng" <wengxt () gmail ! com>
Date: 2013-01-08 23:58:09
Message-ID: 20130108235809.3910.57614 () vidsolbach ! de
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> On Jan. 8, 2013, 11:15 p.m., Xuetian Weng wrote:
> > after I apply the patch, I notice that in some random unknnow case KWindowSystem \
> > will emit the signal, while KSelectionOwner is not. (And I think KSelectionOwner \
> > is correct since I didn't do anything to kwin), and I notice some strange plasma \
> > theme change caused by this.
> > Trying to find you why..
>
> Thomas Lübking wrote:
> The XFixesSelectionNotify event fires one every selection owner event, usually \
> it'll be the cnp system (when you eg. mark text)
> The problem should ideally be fixed in Qt instead of working around it in KDE.
> Untested patch:
>
>
> diff --git a/src/gui/kernel/qapplication_x11.cpp \
> b/src/gui/kernel/qapplication_x11.cpp index 3631f1d..644f0ad 100644
> --- a/src/gui/kernel/qapplication_x11.cpp
> +++ b/src/gui/kernel/qapplication_x11.cpp
> @@ -536,6 +536,7 @@ struct qt_xfixes_selection_event_data
> {
> // which selection to filter out.
> Atom selection;
> + Window window;
> };
>
> #if defined(Q_C_CALLBACKS)
> @@ -548,7 +549,7 @@ static Bool qt_xfixes_scanner(Display*, XEvent *event, XPointer \
> arg) reinterpret_cast<qt_xfixes_selection_event_data*>(arg);
> if (event->type == X11->xfixes_eventbase + XFixesSelectionNotify) {
> XFixesSelectionNotifyEvent *xfixes_event = \
> reinterpret_cast<XFixesSelectionNotifyEvent*>(event);
> - if (xfixes_event->selection == data->selection)
> + if (xfixes_event->selection == data->selection && xfixes_event->window == \
> data->window) return true;
> }
> return false;
> @@ -3462,6 +3463,7 @@ int QApplication::x11ProcessEvent(XEvent* event)
> // we don't want to handle old SelectionNotify events.
> qt_xfixes_selection_event_data xfixes_event;
> xfixes_event.selection = req->selection;
> + xfixes_event.window = req->window;
> for (XEvent ev;;) {
> if (!XCheckIfEvent(X11->display, &ev, &qt_xfixes_scanner, (XPointer)&xfixes_event))
> break;
>
>
> Xuetian Weng wrote:
> but I don't see in near future there will be Qt 4.8.5 nor distro can pick up this \
> patch..
> actually this can cause serious problem, clipboard is so widely used.
>
> I guess if would be better to workaround it for now, I already notice some strange \
> theme change, since clipboard is being initialized by KApplication by default..
And thanks god we have klipper by default... If not, plasma will simply go crazy \
because of no workaround... copy text -> close -> plasma theme changed to opaque
- Xuetian
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/107983/#review25012
-----------------------------------------------------------
On Jan. 5, 2013, 5:08 p.m., Thomas Lübking wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/107983/
> -----------------------------------------------------------
>
> (Updated Jan. 5, 2013, 5:08 p.m.)
>
>
> Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Marco Martin, Martin \
> Gräßlin, and Fredrik Höglund.
>
> Description
> -------
>
> It works fine here (tested so far KWindowSystem signal, KSelectionWatcher only with \
> kwin) with kwin (shift+alt+f12), xcompmgr, compiz & "metacity -c" and e17. Didn't \
> try xfce nor mutter.
> Technically:
> I do not at all understand why KWindowSystem is *not* watching the root window - \
> KSelectionOwner for one is sending events to the root and this also seems the case \
> for all other WMs (at least everything now starts to cause the signal to be \
> emitted)
> The KSelectionWatcher failure seems to be kwin specific (wrote me a cleaner \
> testcase), there'll be some X11 event processing on top that eats away the client \
> messages. So this one can be scratched from the patch, the KWindowSystem issue \
> remains.
>
> This addresses bug 179042.
> http://bugs.kde.org/show_bug.cgi?id=179042
>
>
> Diffs
> -----
>
> kdeui/windowmanagement/kwindowsystem_x11.cpp f9b3cc1
>
> Diff: http://git.reviewboard.kde.org/r/107983/diff/
>
>
> Testing
> -------
>
> see summary
>
>
> Thanks,
>
> Thomas Lübking
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/107983/">http://git.reviewboard.kde.org/r/107983/</a>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <p style="margin-top: 0;">On January 8th, 2013, 11:15 p.m., <b>Xuetian \
Weng</b> wrote:</p> <blockquote style="margin-left: 1em; border-left: 2px solid \
#d0d0d0; padding-left: 10px;"> <pre style="white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">after I apply the patch, I notice that in some random unknnow case \
KWindowSystem will emit the signal, while KSelectionOwner is not. (And I think \
KSelectionOwner is correct since I didn't do anything to kwin), and I notice some \
strange plasma theme change caused by this.
Trying to find you why..</pre>
</blockquote>
<p>On January 8th, 2013, 11:22 p.m., <b>Thomas Lübking</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The \
XFixesSelectionNotify event fires one every selection owner event, usually it'll \
be the cnp system (when you eg. mark text)
The problem should ideally be fixed in Qt instead of working around it in KDE.
Untested patch:
diff --git a/src/gui/kernel/qapplication_x11.cpp \
b/src/gui/kernel/qapplication_x11.cpp index 3631f1d..644f0ad 100644
--- a/src/gui/kernel/qapplication_x11.cpp
+++ b/src/gui/kernel/qapplication_x11.cpp
@@ -536,6 +536,7 @@ struct qt_xfixes_selection_event_data
{
// which selection to filter out.
Atom selection;
+ Window window;
};
#if defined(Q_C_CALLBACKS)
@@ -548,7 +549,7 @@ static Bool qt_xfixes_scanner(Display*, XEvent *event, XPointer \
arg) reinterpret_cast<qt_xfixes_selection_event_data*>(arg);
if (event->type == X11->xfixes_eventbase + XFixesSelectionNotify) {
XFixesSelectionNotifyEvent *xfixes_event = \
reinterpret_cast<XFixesSelectionNotifyEvent*>(event);
- if (xfixes_event->selection == data->selection)
+ if (xfixes_event->selection == data->selection && \
xfixes_event->window == data->window) return true;
}
return false;
@@ -3462,6 +3463,7 @@ int QApplication::x11ProcessEvent(XEvent* event)
// we don't want to handle old SelectionNotify events.
qt_xfixes_selection_event_data xfixes_event;
xfixes_event.selection = req->selection;
+ xfixes_event.window = req->window;
for (XEvent ev;;) {
if (!XCheckIfEvent(X11->display, &ev, &qt_xfixes_scanner, \
(XPointer)&xfixes_event)) break;
</pre>
</blockquote>
<p>On January 8th, 2013, 11:51 p.m., <b>Xuetian Weng</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">but I don't see in \
near future there will be Qt 4.8.5 nor distro can pick up this patch..
actually this can cause serious problem, clipboard is so widely used.
I guess if would be better to workaround it for now, I already notice some strange \
theme change, since clipboard is being initialized by KApplication by default..</pre> \
</blockquote>
</blockquote>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">And thanks god we have \
klipper by default... If not, plasma will simply go crazy because of no workaround... \
copy text -> close -> plasma theme changed to opaque</pre> <br />
<p>- Xuetian</p>
<br />
<p>On January 5th, 2013, 5:08 p.m., Thomas Lübking wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
style="background-image: \
url('http://git.reviewboard.kde.org/media/rb/images/review_request_box_top_bg.png'); \
background-position: left top; background-repeat: repeat-x; border: 1px black \
solid;"> <tr>
<td>
<div>Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Marco Martin, Martin \
Gräßlin, and Fredrik Höglund.</div> <div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated Jan. 5, 2013, 5:08 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">It works fine here (tested so far KWindowSystem signal, \
KSelectionWatcher only with kwin) with kwin (shift+alt+f12), xcompmgr, compiz & \
"metacity -c" and e17. Didn't try xfce nor mutter.
Technically:
I do not at all understand why KWindowSystem is *not* watching the root window - \
KSelectionOwner for one is sending events to the root and this also seems the case \
for all other WMs (at least everything now starts to cause the signal to be emitted)
The KSelectionWatcher failure seems to be kwin specific (wrote me a cleaner \
testcase), there'll be some X11 event processing on top that eats away the client \
messages. So this one can be scratched from the patch, the KWindowSystem issue \
remains.</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">see summary</pre> </td>
</tr>
</table>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=179042">179042</a>
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kdeui/windowmanagement/kwindowsystem_x11.cpp <span style="color: \
grey">(f9b3cc1)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/107983/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
</tr>
</table>
</div>
</body>
</html>
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