Re: Cursor anomoly: apparent and actual positions differ

Hi John!

On Mo, 30 Apr 2012, John Beckett wrote:

> I confirm there is a bug (Vim 7.3.509 on Windows).
>
> I slightly simplified the example to show the minimum that
> demonstrates the problem, as below:
>
> " ----------- start bug.txt ------------------
> " To show anomaly, launch Vim as:
> " vim -N -u NONE bug.txt
> " and enter:
> " :so %
> " :13
> "
> if v:version >= 700
> au BufLeave * let b:winview = winsaveview()
> au BufEnter * if exists('b:winview') | call winrestview(b:winview) | endif
> endif
> "
> " Now enter:
> " :copen
> " CTRL-W CTRL-W
> " Stop and see where cursor is, then press j
> " which shows that cursor was NOT where it appeared to be.
> " First pressing Ctrl-L or entering :redraw do not help.
> " ----------- end bug.txt --------------------
>
> There is no problem if use ':new' or ':rightbelow new' instead
> of ':copen'. Seems the quickfix window is part of problem.
>
> I can also see the problem if start Vim normally, then just yank
> the two au commands and use :@" to source them, then enter
> :copen Ctrl-W w. I have seen the cursor end up in the tildes
> after end-of-file.
>
> Using ':echo b:winview' shows:
> {'lnum': 13, 'leftcol': 0, 'col': 0, 'topfill': 0,
> 'topline': 11, 'coladd': 0, 'skipcol': 0, 'curswant': 0}
>
> It looks like topline is wrong.

Looks like a redraw issue to me. This fixes it for me:
diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -18507,7 +18507,7 @@
check_cursor();
changed_cline_bef_curs();
invalidate_botline();
- redraw_later(VALID);
+ redraw_later(NOT_VALID);

if (curwin->w_topline == 0)
curwin->w_topline = 1;


regards,
Christian

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