[UE5.1.1, Bug Report] Input Key Selector widget ignores modifier keys.

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  1. add an input key selector widget to your UserWidget.
  2. run PIE, click the widget and select an input key using the keyboard.
  3. G works, Shift + G works, Ctrl + G works, but Shift + Ctrl + G just sets “G”.

with such a widget it either just works or is unusable to me. If I want to set an entire input chord I want to do just that. On mouse it’s not even working at all. It’s pointless to include features which are broken. “Here’s a new bike, flat tires but you can fix that right?”. Every single feature released.

Here’s the issue:

FReply SInputKeySelector::OnKeyUp( const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent )
{
	FKey KeyUp = InKeyEvent.GetKey();
	EModifierKey::Type ModifierKey = EModifierKey::FromBools(
		InKeyEvent.IsControlDown() && KeyUp != EKeys::LeftControl && KeyUp != EKeys::RightControl,
		InKeyEvent.IsAltDown() && KeyUp != EKeys::LeftAlt && KeyUp != EKeys::RightAlt,
		InKeyEvent.IsShiftDown() && KeyUp != EKeys::LeftShift && KeyUp != EKeys::RightShift,
		InKeyEvent.IsCommandDown() && KeyUp != EKeys::LeftCommand && KeyUp != EKeys::RightCommand );

	// Dont allow chords consisting of just modifier keys.
	if ( bIsSelectingKey && (bAllowGamepadKeys || KeyUp.IsGamepadKey() == false) && ( KeyUp.IsModifierKey() == false || ModifierKey == EModifierKey::None ) )
	{
		SetIsSelectingKey( false );

		if (bEscapeCancelsSelection && (KeyUp == EKeys::Escape || IsEscapeKey(KeyUp)))
		{
			return FReply::Handled();
		}

		SelectKey(
			KeyUp,
			ModifierKey == EModifierKey::Shift,
			ModifierKey == EModifierKey::Control,
			ModifierKey == EModifierKey::Alt,
			ModifierKey == EModifierKey::Command);
		return FReply::Handled();
	}
	else if (!bIsSelectingKey && Button.IsValid())
	{
		return Button->OnKeyUp(MyGeometry, InKeyEvent);
	}

	return SCompoundWidget::OnKeyUp( MyGeometry, InKeyEvent );
}

Go catch em all