Do not modify the changed() status of rows when no drawing has taken place

Do not modify the changed() status of rows when no drawing has taken place

There are several places in the code where a row is painted with drawing disabled in the painter. The goal is only to recompute inset positions.

Such a case happens in BufferView::checkCursorScrollOffset, as part of the horizontal scrolling patch. Note that this particular piece of code should eventually be removed, since it is a performance problem.

It makes sense to consider that only a real painting of a row should change its status. However, I would not be surprised if this change would break other things.

Fixes: #9388