DolphinQt: assume QT_VERSION_CHECK >= 6.0.0

Source/Core/DolphinQt/Config/ToolTipControls/BalloonTip.cpp

@@ -16,12 +16,7 @@
 #include <QPushButton>
 #include <QStyle>
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
 #include <QScreen>
-#else
-#include <QApplication>
-#include <QDesktopWidget>
-#endif
 
 #if defined(__APPLE__)
 #include <QToolTip>
@@ -105,11 +100,7 @@ BalloonTip::BalloonTip(PrivateTag, const QIcon& icon, QString title, QString mes
   message_label->setTextFormat(Qt::RichText);
   message_label->setAlignment(Qt::AlignTop | Qt::AlignLeft);
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-  const int limit = QApplication::desktop()->availableGeometry(message_label).width() / 3;
-#else
   const int limit = message_label->screen()->availableGeometry().width() / 3;
-#endif
   message_label->setMaximumWidth(limit);
   message_label->setSizePolicy(QSizePolicy::Policy::MinimumExpanding,
                                QSizePolicy::Policy::MinimumExpanding);
@@ -136,14 +127,11 @@ void BalloonTip::UpdateBoundsAndRedraw(const QPoint& pos, ShowArrow show_arrow)
 {
   m_show_arrow = show_arrow == ShowArrow::Yes;
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-  const QRect screen_rect = QApplication::desktop()->screenGeometry(pos);
-#else
   QScreen* screen = QGuiApplication::screenAt(pos);
   if (!screen)
     screen = QGuiApplication::primaryScreen();
   const QRect screen_rect = screen->geometry();
-#endif
+
   QSize sh = sizeHint();
   // The look should resemble the default tooltip style set in Settings::SetCurrentUserStyle()
   const int border = 1;

Source/Core/DolphinQt/Config/ToolTipControls/ToolTipWidget.h

@@ -22,11 +22,7 @@ public:
   void SetDescription(QString description) { m_description = std::move(description); }
 
 private:
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-  void enterEvent(QEvent* event) override
-#else
   void enterEvent(QEnterEvent* event) override
-#endif
   {
     if (m_timer_id)
       return;

Source/Core/DolphinQt/Debugger/MemoryViewWidget.cpp

@@ -212,11 +212,7 @@ void MemoryViewWidget::UpdateFont()
   // BoundingRect is too unpredictable, a custom one would be needed for each view type. Different
   // fonts have wildly different spacing between two characters and horizontalAdvance includes
   // spacing.
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
   m_font_width = fm.horizontalAdvance(QLatin1Char('0'));
-#else
-  m_font_width = fm.width(QLatin1Char('0'));
-#endif
   m_table->setFont(Settings::Instance().GetDebugFont());
 
   CreateTable();

Source/Core/DolphinQt/GBAWidget.cpp

@@ -514,12 +514,7 @@ void GBAWidget::mouseMoveEvent(QMouseEvent* event)
 {
   if (!m_moving)
     return;
-  auto event_pos =
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-      event->globalPosition().toPoint();
-#else
-      event->globalPos();
-#endif
+  auto event_pos = event->globalPosition().toPoint();
   move(event_pos - m_move_pos - (geometry().topLeft() - pos()));
 }