Christian Brabandt wrote:
> On Mon, July 1, 2013 17:45, Ingo Karkat wrote:
> > Hello Vim developers,
> >
> > I noticed a regression:
> >
> > $ vim -N -u NONE
> > :echo "foo"
> > " The intro message is cleared, the (now empty) UI does not show "foo".
> > " Expected behavior: The intro message stays visible, the command-line
> > shows "foo".
> >
> > This happens with any command that echoes a single line, e.g. also with
> > :set ic?, or :nmap. Only the very first command (output) is affected;
> > subsequent commands (after the intro message was cleared) show up fine.
> > I see this in Vim 7.3.1280 (huge build on Ubuntu 13.04/x64), but not in
> > Vim 7.3.712. It also doesn't happen in GVIM, only in the terminal UI.
>
> I don't see this for vim -u NONE -N (and I suspect, this is terminal
> related),
Yes, AFAIK it only happens when the termresponse causes a redraw. For
xterm that is when t_CO is received.
> but for me this happens, because I have a plugin, that resets
> some highlighting groups whenever the statusline is drawn. This triggers
> a do_highlight() call, which in turn calls redraw_win_later() and resets
> must_redraw, although it has been set to zero earlier in update_screen()
Hmm, changing highlighting while busy redrawing is bad. I'm not sure if
we would care to make this work. Generally it would require a redraw.
Vim doesn't know only the status line would be affected.
> This patch fixes it for me, but I am not sure, this also fixes your
> issue:
This basically ignores the problem: If anything sets must_redraw while
redrawing it gets discarded. I suspect this will cause trouble in some
situations. There already is a flag to prevent recursion, weird
things do happen. E.g. a resize while redrawing.
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