Version:           unspecified (using Devel) 
OS:                Linux

When I copy some files in Dolphin (Ctrl+C), plasma-desktop is blocked for about 10-15s. During this time the desktop does not repaint when I move the dolphin window arround, and I can't use the task-bar or k-menu, however Dolphin stays functional.

I was able to get a stacktrace while plasma was blocked:

Thread 1 (Thread 0xb76e9780 (LWP 14377)):
#0  0x00b2b832 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x00c231d1 in select () from /lib/libc.so.6
#2  0x03263193 in QX11Data::clipboardWaitForEvent(unsigned long, int, _XEvent*, int) () from /usr/lib/libQtGui.so.4
#3  0x032643c2 in QClipboardWatcher::getDataInFormat(unsigned long) const () from /usr/lib/libQtGui.so.4
#4  0x03264701 in QClipboardWatcher::retrieveData_sys(QString const&, QVariant::Type) const () from /usr/lib/libQtGui.so.4
#5  0x031ee258 in QInternalMimeData::retrieveData(QString const&, QVariant::Type) const () from /usr/lib/libQtGui.so.4
#6  0x02456cfb in QMimeDataPrivate::retrieveTypedData(QString const&, QVariant::Type) const () from /usr/lib/libQtCore.so.4
#7  0x02457602 in QMimeData::data(QString const&) const () from /usr/lib/libQtCore.so.4
#8  0x02681194 in KUrl::List::fromMimeData(QMimeData const*, KUrl::List::DecodeOptions, QMap<QString, QString>*) () from /usr/lib/libkdecore.so.5
#9  0x02681659 in KUrl::List::fromMimeData(QMimeData const*, QMap<QString, QString>*) () from /usr/lib/libkdecore.so.5
#10 0x03c672c7 in KIO::pasteActionText() () from /usr/lib/libkio.so.5
#11 0x0108e117 in FolderView::clipboardDataChanged() () from /usr/lib/kde4/plasma_applet_folderview.so
#12 0x010977be in FolderView::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/plasma_applet_folderview.so
#13 0x0244e06b in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x0245d085 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x038c5428 in QClipboard::dataChanged() () from /usr/lib/libQtGui.so.4
#16 0x0325c754 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#17 0x03288252 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib/libQtGui.so.4
#18 0x04380525 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#19 0x04384268 in g_main_context_iterate () from /lib/libglib-2.0.so.0
#20 0x04384449 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#21 0x02472fd6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#22 0x03287cc6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtGui.so.4
#23 0x0244760a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0x0244794a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#25 0x0244bf77 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#26 0x031d6838 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#27 0x044785d0 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#28 0x080487ac in main ()



Reproducible: Always

Steps to Reproduce:
1. Open Dolphin
2. Select a File
3. Press Ctrl + C

Actual Results:  
Plama is blocked for 10-15s

Expected Results:  
no blocking