Qt: Fix arrow key handling on macOS

pcsx2-qt/QtKeyCodes.cpp

@@ -513,5 +513,22 @@ std::optional<std::string> InputManager::ConvertHostKeyboardCodeToString(u32 cod
 
 u32 QtUtils::KeyEventToCode(const QKeyEvent* ev)
 {
-	return static_cast<u32>(ev->key()) | (static_cast<u32>(ev->modifiers()) & static_cast<u32>(Qt::KeypadModifier));
+	int key = ev->key();
+	Qt::KeyboardModifiers modifiers = ev->modifiers();
+
+#ifdef __APPLE__
+	// On macOS, Qt applies the Keypad modifier regardless of whether the arrow keys, or numpad was pressed.
+	// The only way to differentiate between the keypad and the arrow keys is by the text.
+	// Hopefully some keyboard layouts don't change the numpad positioning...
+	if (modifiers & Qt::KeypadModifier && key >= Qt::Key_Insert && key <= Qt::Key_PageDown)
+	{
+		if (ev->text().isEmpty())
+		{
+			// Drop the modifier, because it's probably not actually a numpad push.
+			modifiers &= ~Qt::KeypadModifier;
+		}
+	}
+#endif
+
+	return static_cast<u32>(key) | (static_cast<u32>(modifiers) & static_cast<u32>(Qt::KeypadModifier));
 }