My message part (right part of the chatview) jumps to the right when I move the mouse pointer

Originally I observed that the error occurs when I move the mouse pointer out of the Application Window. The error also seems to occur in the maximized window. I still have to observe how this can be reliably reproduced.

My expectation would be that a mouse pointer movement has no influence on the position of individual window contents.

Could this be caused by the new chatview?