Looking at dump files where we crash in AlphaBlendU with a non-null pointer access violation, Claude Code has pointed to CXTPCommandBarAnimation::RedrawRect where lpRect == NULL.

CC thinks RemoveAnimations needs to be called there. I have verified debugging that if I have collapsed groups and click and move over etc. that function is called with a NULL lpRect. It is also called when we programmatically set the popup of a collapsed group with a "find command" tool we have. It is also called when clicking a button on the ribbon.

But still, I never crash. This is "random" in our code base. Can a CJ expert confirm or deny this change is needed:

void CXTPCommandBarAnimation::RedrawRect(LPCRECT lpRect, BOOL bAnimate)
{
    if (lpRect == NULL)
    {
        m_bmpCache.DeleteObject();
        RemoveAnimations();
    }

So far in testing I find nothing bad happening. So, I got that going for me.