Split moving selects and scrolls

[rjahn]

Open the Slow rendering screen of bug user, insert a new record and drag the split handle.
This sometimes selects text on the right and scrolls the table on the left.

It depends on the focused element before dragging, e.g. if you focus the field "Mehrzeiliger Text" and start dragging - table will scroll in 90% of test cases - sometimes it does not scroll.

And sometimes the labels on the right are highlighted after dragging (at the end of the video).

See screencast

SplitDrag.mp4