QtDialog: remove Qt4-only code

The `reset()` method was actually deprecated for 5.0 which means it can
now be removed here.

Source/QtDialog/CMakeSetup.cxx

@@ -115,14 +115,6 @@ int main(int argc, char** argv)
   QTextCodec* utf8_codec = QTextCodec::codecForName("UTF-8");
   QTextCodec::setCodecForLocale(utf8_codec);
 
-#if QT_VERSION < 0x050000
-  // clean out standard Qt paths for plugins, which we don't use anyway
-  // when creating Mac bundles, it potentially causes problems
-  foreach (QString p, QApplication::libraryPaths()) {
-    QApplication::removeLibraryPath(p);
-  }
-#endif
-
   // tell the cmake library where cmake is
   QDir cmExecDir(QApplication::applicationDirPath());
 #if defined(Q_OS_MAC)

Source/QtDialog/QCMake.cxx

@@ -340,11 +340,7 @@ void QCMake::interrupt()
 
 bool QCMake::interruptCallback()
 {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  return this->InterruptFlag;
-#else
   return this->InterruptFlag.load();
-#endif
 }
 
 void QCMake::progressCallback(const std::string& msg, float percent)

Source/QtDialog/QCMakeCacheView.cxx

@@ -155,11 +155,7 @@ QModelIndex QCMakeCacheView::moveCursor(CursorAction act,
 
 void QCMakeCacheView::setShowAdvanced(bool s)
 {
-#if QT_VERSION >= 040300
-  // new 4.3 API that needs to be called.  what about an older Qt?
   this->SearchFilter->invalidate();
-#endif
-
   this->AdvancedFilter->setShowAdvanced(s);
 }
 
@@ -209,9 +205,7 @@ void QCMakeCacheModel::clear()
 
 void QCMakeCacheModel::setProperties(const QCMakePropertyList& props)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
   this->beginResetModel();
-#endif
 
   QSet<QCMakeProperty> newProps;
   QSet<QCMakeProperty> newProps2;
@@ -321,11 +315,7 @@ void QCMakeCacheModel::setProperties(const QCMakePropertyList& props)
   }
 
   this->blockSignals(b);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
   this->endResetModel();
-#else
-  this->reset();
-#endif
 }
 
 QCMakeCacheModel::ViewType QCMakeCacheModel::viewType() const
@@ -335,9 +325,7 @@ QCMakeCacheModel::ViewType QCMakeCacheModel::viewType() const
 
 void QCMakeCacheModel::setViewType(QCMakeCacheModel::ViewType t)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
   this->beginResetModel();
-#endif
 
   this->View = t;
 
@@ -354,11 +342,7 @@ void QCMakeCacheModel::setViewType(QCMakeCacheModel::ViewType t)
   this->setProperties(oldProps);
   this->setProperties(props);
   this->blockSignals(b);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
   this->endResetModel();
-#else
-  this->reset();
-#endif
 }
 
 void QCMakeCacheModel::setPropertyData(const QModelIndex& idx1,
@@ -484,8 +468,7 @@ QCMakePropertyList QCMakeCacheModel::properties() const
       // go to the next in the tree
       while (!idxs.isEmpty() &&
              (
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0) &&                                \
-  QT_VERSION < QT_VERSION_CHECK(5, 1, 0)
+#if QT_VERSION < QT_VERSION_CHECK(5, 1, 0)
                (idxs.last().row() + 1) >= rowCount(idxs.last().parent()) ||
 #endif
                !idxs.last().sibling(idxs.last().row() + 1, 0).isValid())) {
@@ -645,20 +628,6 @@ bool QCMakeCacheModelDelegate::editorEvent(QEvent* e,
   return success;
 }
 
-// Issue 205903 fixed in Qt 4.5.0.
-// Can remove this function and FileDialogFlag when minimum Qt version is 4.5
-bool QCMakeCacheModelDelegate::eventFilter(QObject* object, QEvent* evt)
-{
-  // workaround for what looks like a bug in Qt on macOS
-  // where it doesn't create a QWidget wrapper for the native file dialog
-  // so the Qt library ends up assuming the focus was lost to something else
-
-  if (evt->type() == QEvent::FocusOut && this->FileDialogFlag) {
-    return false;
-  }
-  return QItemDelegate::eventFilter(object, evt);
-}
-
 void QCMakeCacheModelDelegate::setModelData(QWidget* editor,
                                             QAbstractItemModel* model,
                                             const QModelIndex& index) const

Source/QtDialog/QCMakeCacheView.h

@@ -144,7 +144,6 @@ public:
   bool editorEvent(QEvent* event, QAbstractItemModel* model,
                    const QStyleOptionViewItem& option,
                    const QModelIndex& index);
-  bool eventFilter(QObject* object, QEvent* event);
   void setModelData(QWidget* editor, QAbstractItemModel* model,
                     const QModelIndex& index) const;
   QSize sizeHint(const QStyleOptionViewItem& option,