Re: [PATCH v3 2/3] mergetools: vimdiff: fix single tab mode, single window mode and colors

[Fernando Ramos <greenfoo@u92.eu>]

On 22/08/08 01:37AM, Felipe Contreras wrote:
> On Mon, Aug 8, 2022 at 12:35 AM Fernando Ramos <greenfoo@u92.eu> wrote:
> >
> > vimdiff3 was introduced in 7c147b77d3 (mergetools: add vimdiff3 mode,
> > 2014-04-20) and then partially broken in 0041797449 (vimdiff: new
> > implementation with layout support, 2022-03-30) in two ways:
> >
> >     - It does not show colors unless the user has "set hidden" in his
> >       .vimrc file
> >
> >     - It prompts the user to "Press ENTER" every time it runs.
> 
> For the record, in my version these two issues are fixed in a much simpler way:
> 

Yes, it was simpler but remember it had two small issues:

  1. In "vimdiff3" mode, if you switch to buffers #2 or #3, highlighting
     disappears.

  2. It treats a single tab with a single window as a special case, when in
     fact it is just a subcase of a layout with many tabs where one of them
     contains just one window.
     The new patch series makes no distinction between them by keeping track
     of the number of windows opened on each tab which, as you noted, adds
     some extra complexity (but needed complexity nevertheless if we want to
     have highlighting enabled in all cases)


> >         # Add an extra "-c" option to move to the first tab (notice that we
> >         # can't simply append the command to the previous "-c" string as
> >         # explained here: https://github.com/vim/vim/issues/9076
> >
> > -       FINAL_CMD="-c \"$CMD\" -c \"tabfirst\""
> > +       FINAL_CMD="-c \"set hidden diffopt-=hiddenoff diffopt-=closeoff\" -c \"$CMD\" -c \"tabfirst\""
> >  }
> 
> These diffopt settings look awfully familiar.
> 

I would go as far as saying they are the same :)

As you explained, it is better to keep these options explicitly set so that
buffer diff'ing works in all cases.

Notice that in this new patch series, however, these options apply to all
layouts (and not just to "vimdiff3"), as we want highlighting to also be
enabled in multi-tab single window layouts.


PS: I have been testing many layouts today with and without an empty .vimrc and
everything seems to work. But it would be great if others reading this did the
same to make sure there are no other strange vim configuration options that
affect the way diffs are displayed (as, unfortunately, we have found out in the
past more than once!)

Thanks!