Undoing scrolls to top of document.

[LeifAndersen]

Pressing ctrl+z to undo currently scrolls the document back to the top. This makes multiple undos on large files rather difficult.

I would expect the document to either stay in the current position, or possibly scroll to the undo site, when pressing undo.

[LeifAndersen]

This seems to be caused by undoing/redoing stuff in the range of text occupied by a visr.