Lech Lorens wrote:
> > > It is possible to scroll down (i.e. CTRL-Y in normal mode) an empty
> > > buffer if it is being compared with another buffer consisting of at
> > > least two lines. This means it is possible for the cursor to appear
> > > "outside of the file" - on nonexistent lines.
> > >
> > > To reproduce the problem edit any file and e.g.:
> > > :diffsplit /dev/null
> > > Then try to scroll /dev/null with CTRL-Y.
> > >
> > > This patch disallows such behaviour.
> >
> > The scrolling is OK so long as the filler lines fit in the window.
> > This is useful to be able to see the added lines in the other window.
> >
> > But currently it tries to add too many, the cursor is displayed outside
> > of the window if you scroll far enough.
> >
> > Please check this patch:
>
> Your patch does not seem to address the problem I've been trying to
> describe.
>
> I am not sure whether I have managed to explain the problem I am
> observing well enough.
>
> I will draw what I am observing:
> ~ - are the nonexistent line, i.e. after the end of the file,
> _ - is the cursor
> I have 2 windows in diff mode, the cursor is on the only displayed line
> in window 1.
>
> window 1 window 2
> /dev/null file.txt
> +------------+------------+
> |_ |last line |
> |~ |~ |
> |~ |~ |
> |~ |~ |
> |~ |~ |
> |~ |~ |
> +------------+------------+
>
> If I press CTRL-Y twice, the situation is as follows:
> +------------+------------+
> | |last line |
> |~ |~ |
> |_ |~ |
> |~ |~ |
> |~ |~ |
> |~ |~ |
> +------------+------------+
> which means the cursor is displayed out of bounds - on the second
> nonexistent line.
>
> Also, from your reply I infer that my patch breaks some functionality.
> I haven't observed any such side effects. Could you elaborate on it
> a little bit?
When I try this I get:
window 1 window 2
/dev/null file.txt
+------------+------------+
|filler |last - 2 |
|filler |last - 1 |
|_ |last line |
|~ |~ |
|~ |~ |
|~ |~ |
+------------+------------+
Thus two filler lines are inserted, the file.txt window scrolls down.
If I remove "filler" from 'diffopt' then I don't get any scrolling.
Perhaps it depends on your option values, can you find out?
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