Bug 213753

Well, this is a new feature in vte, showing a bug in less...
New in vte is that it keeps logical lines intact, while adds a newline where the
original stream had a newline.  This is the way it should work, and is what
xterm does too.

Now less (and more) explicity break the line even if the terminal emulator is
already doing that.

Got a report of this upstream today.  I now get it, with your description. 
Anyway, this is the upstream:

  http://bugzilla.gnome.org/show_bug.cgi?id=368106

It is not just less, it is also more, mc, vim, ...
Are you saying we need to change all apps to cope with a new vte "feature"?

mc, vim, joe was not working in older versions too. This new feature affects
only less and more. Problems are with less and more also in xterm, it is not
only a "vte feature bug".

Can it be fixed in termcap or ncurses? I think all these programs using each of
them.

mc, vim were working in FC5 just fine.
Try in FC5:
vim
i
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
and copy&paste that, it will be one line.
Similarly save that into a file, mc and hit F3, copy&paste from there.
joe for long lines doesn't wrap them in the terminal, so it isn't a thing
we are talking about here (and, emacs inserts \ at the end of the lines).

(In reply to comment #4)
> mc, vim were working in FC5 just fine.
> Try in FC5:
> vim
> i
>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
> and copy&paste that, it will be one line.

True.  But it will be bogus for a line of 80 "a"s followed by any other line. 
What vte is doing now (and xterm does too) is to give you the real thing.  If
the input had a CR there, you will get a newline.  Instead of insisting on
getting the old behavior one should look into how to fix it correctly with
minimal effort.

> Similarly save that into a file, mc and hit F3, copy&paste from there.
> joe for long lines doesn't wrap them in the terminal, so it isn't a thing
> we are talking about here (and, emacs inserts \ at the end of the lines).

The change to vte had to be preceeded by a reality check and not change until
at least the vast majority of applications can cope with it.
I think this should be reverted ASAP and if we manage to change at least most
commonly used apps for FC7, let's reenable it then.
Another app that is broken by this is e.g. links.

It affects also the simple reverse-search-history (C-r) in readline/bash(1),
sometimes pasting errorneous (cut) commands.

Couldn't we ask at least for some backward compatibility settings setable in
gconf? It really hurts terminal working people a lot.

Someone should debug and see which termcap capability controls this and get vte
to advertise the right info instead.  AFAIS the new behavior is both the more
correct, and exactly what xterm does.

Linux console copy&paste (with gpm) works the same as FC5 gnome-terminal for
the
echo
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa | less
testcase.
There are other issues with the current misbehavior:
Try say
links 'http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=245035#c2'
and try to copy&paste the ChangeLog entry (shift+left mouse button is needed
in links to select).
In FC5 gnome-terminal no line has any whitespace at the end of the lines,
in FC6+ gnome-terminal all lines have spaces at the end of the lines.
Again, that's something I have to manually remove when say pasting into
editor (joe, vim), as that's generally very undesirable.
Linux console works even here the same as FC5 gnome-terminal.

Jakub, I don't understand.  Are you saying that copying ChangeLog entries from
inside gnome-terminal fills the line with space?  I definitely can't reproduce
that here.  The ChangeLog entry posted at the link you pasted already has
trailing spaces. 

Yeah, most probably introduced by this gnome-terminal bug.
So try pasting from the first comment in
links http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240749
instead.  If links runs in FC5 gnome-terminal, it works well, in FC6+
gnome-terminal the trailing whitespace is present.

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Actually, Jakub, can you reproduce this with Rawhide? I cannot.

Created attachment 304673 [details]
illustration of non-reproduction

If I could, I think it would be best to move this bug to Rawhide before it is fixed.

I suggest the component be changed to less.

At any rate, this bug should show up upstream before anyone from g-t side would
care about it.

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