Clearing out klipper history allows dolphin to start immediately. Not doing this means gwenview stays frozen forever.

0x00007ffff32ba743 in select () at ../sysdeps/unix/syscall-template.S:81
81	../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) bt
#0  0x00007ffff32ba743 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffe537f7f0 in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#2  0x00007fffe537fe0f in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#3  0x00007fffe53817a0 in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#4  0x00007ffff4370aa9 in QInternalMimeData::formats() const ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#5  0x00007ffff6a4adda in ?? ()
   from /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#6  0x00007ffff6a4b0b2 in KIO::canPasteMimeData(QMimeData const*) ()
   from /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#7  0x00007ffff6a4c72b in KIO::pasteActionText(QMimeData const*, bool*, KFileItem const&) () from /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#8  0x000000000045f447 in Gwenview::FileOpsContextManagerItem::updatePasteAction() ()
#9  0x00007ffff3bba30a in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff436d599 in QClipboard::emitChanged(QClipboard::Mode) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007fffe5380039 in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
---Type <return> to continue, or q <return> to quit---
#12 0x00007fffe5386645 in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#13 0x00007fffe5387363 in ?? ()
   from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#14 0x00007ffff3bbb1d1 in QObject::event(QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ffff490eb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ffff4914230 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ffff3b89a9b in QCoreApplication::notifyInternal(QObject*, QEvent*)
    () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ffff3b8bbd7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ffff3be09f3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fffee4bc037 in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007fffee4bc290 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fffee4bc33c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007ffff3be0dff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007ffff3b872da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>---Type <return> to continue, or q <return> to quit---
) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007ffff3b8ee4c in QCoreApplication::exec() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x000000000043eea0 in main ()


Reproducible: Always

Steps to Reproduce:
Start the redundant klipper process (plasma also has its own clipboard widget/process? by default).
Enable Synchronize contents of the clipboard and selection
Copy text such as 日本語
Start gwenview

Actual Results:  
hangs

Expected Results:  
starts

dolphin has the same bug as reported here -> https://bugs.kde.org/show_bug.cgi?id=352052