Description of problem:
After the latest update of Qt and KDE the Qt Designer no longer starts. Prior to the update it started without issue. I was able to track down what appears to be the underlying cause. It seems there's an issue with having the package skrooge-2.9.0-1.mga6 installed and Qt designer. Having these two applications installed worked fine prior to the update.

Below is the snippet from GDB.
(gdb) r
Starting program: /usr/bin/designer
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffea624700 (LWP 18186)]
[New Thread 0x7fffdcd17700 (LWP 18187)]
[New Thread 0x7fffcd756700 (LWP 18188)]
Error while reparenting!
Designer: A class name mismatch occurred when creating a widget using the custom widget factory registered for widgets of class KDialog. It returned a widget of class QDialog.
QMetaProperty::read: Unable to handle unregistered datatype 'SelectionBehavior' for property 'QTabBar::selectionBehaviorOnRemove'
QMetaProperty::read: Unable to handle unregistered datatype 'ActionTypes' for property 'KShortcutsEditor::actionTypes'
[New Thread 0x7fffcb8f1700 (LWP 18190)]
Hspell: can't open /usr/share/hspell/hebrew.wgz.sizes.
sonnet.plugins.hspell: HSpellDict::HSpellDict: Init failed
QMetaProperty::read: Unable to handle unregistered datatype 'SKGUnitObject' for property 'SKGUnitComboBox::unit'
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
 
Thread 1 "designer" received signal SIGSEGV, Segmentation fault.
0x00007fffd1726424 in WebCore::createMarkup(WebCore::Range const&, WTF::Vector<WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul>*, WebCore::EAnnotateForInterchange, bool, WebCore::EAbsoluteURLs) () from /lib64/libQt5WebKit.so.5
(gdb) bt
#0  0x00007fffd1726424 in WebCore::createMarkup(WebCore::Range const&, WTF::Vector<WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul>*, WebCore::EAnnotateForInterchange, bool, WebCore::EAbsoluteURLs) () at /lib64/libQt5WebKit.so.5
#1  0x00007fffd1767bd3 in WebCore::Range::toHTML() const ()
   at /lib64/libQt5WebKit.so.5
#2  0x00007fffd0b4a4a6 in QWebPageAdapter::selectedHtml() const ()
   at /lib64/libQt5WebKit.so.5
#3  0x00007fffd3238f11 in QWebPage::selectedHtml() const ()
   at /lib64/libQt5WebKitWidgets.so.5
#4  0x00007fffd323f466 in QWebView::selectedHtml() const ()
   at /lib64/libQt5WebKitWidgets.so.5
#5  0x00007fffd323f731 in QWebView::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () at /lib64/libQt5WebKitWidgets.so.5
#6  0x00007fffd323ffeb in QWebView::qt_metacall(QMetaObject::Call, int, void**) () at /lib64/libQt5WebKitWidgets.so.5
#7  0x00007fffcc9bdce5 in SKGWebView::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib64/qt5/plugins/designer/libskgbaseguidesigner.so
#8  0x00007ffff668471e in QMetaProperty::read(QObject const*) const ()
   at /lib64/libQt5Core.so.5
#9  0x00007ffff77eeb6d in (anonymous namespace)::QDesignerMetaProperty::read(QObject const*) const () at /lib64/libQt5Designer.so.5
#10 0x00007ffff77a6f83 in QDesignerPropertySheet::metaProperty(int) const ()
   at /lib64/libQt5Designer.so.5
#11 0x00007ffff77aa15d in QDesignerPropertySheet::property(int) const ()
---Type <return> to continue, or q <return> to quit---
   at /lib64/libQt5Designer.so.5
#12 0x00007ffff77e47ee in qdesigner_internal::WidgetDataBase::defaultPropertyValues(QString const&) () at /lib64/libQt5Designer.so.5
#13 0x00007ffff77e4a77 in qdesigner_internal::WidgetDataBase::grabDefaultPropertyValues() () at /lib64/libQt5Designer.so.5
#14 0x000000000042ff53 in QDesignerWorkbench::QDesignerWorkbench() ()
#15 0x0000000000429887 in QDesigner::parseCommandLineArguments() ()
#16 0x0000000000418993 in main ()


Version-Release number of selected component (if applicable):

How reproducible:


Steps to Reproduce:
1. Install Qt Designer
2. Install skrooge
3. Launch Qt Designer.