Tip #105: combining move and scroll

I sometimes found myself moving down a few lines with j, then scrolling down
about the same number of lines with <C-E> to put the cursor in roughly the
same place as it started.  I decided I wanted to map <C-J> (and <C-K>,
respectively) to the move-and-scroll operation.  First, I did

    :map <C-J> <C-E>j

This was pretty good, but behaved funny at the beginning and end of files.
Then, I realized that <C-D> already combined move and scroll, so I figured
that giving <C-D> a count of 1 would do it:

    :map <C-J> 1<C-D>

Unfortunately, this permanently attaches a count to <C-D> (ugh!), so I have
to undo that:

    :map <C-J> 1<C-D>:set scroll=0<CR>

This has the drawback of not necessarily resetting scroll to its original
value, but since I never change scroll, it's good enough for me.  It would
be nice if there were a version of <C-D> that did not have the side-affect
of changing scroll.

Happy vimming,
Andrew


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