Heh. Since the time this bug was filed, I've become an upstream co-
maintainer for GNU screen ^_^

Thanks for your patience. I've only recently discovered the full truth
of this issue.

As previously mentioned, there are three parts to this: (1) ncurses, (2)
screen, and (3) vim. As it turns out, (1) was somewhat wrong, because
terminfo has _long_ supported, via extension features, specification of
various modified keys; however, the stock terminfo definitions from
ncurses don't include control-pageup/pagedown, though they _do_ support
control-left, control-right... Debian/Ubuntu's terminfo definitions
don't include any of the extended features. So there would still be a
terminfo enhancement to include those definitions (probably named kPRV5
and kNXT5).

(2) is more-or-less this bug, tracked upstream at savannah:
https://savannah.gnu.org/bugs/?24076

(3) requires modifying vim to use terminfo entries, whereas it currently
uses termcap entries. You'll probably have to convince Bram Moolenaar of
that. A good start would be to file a bug (upstream, ideally, or at
least reported to the mailing list; I don't think they have a
bugtracker) to support terminfo's kLFT5, etc, names, to indicate (in
that example) control-left-arrow. This is a fairly involved change in
vim, so it might take some effort to get that going. I suspect folks may
have already broached the subject of terminfo support for vim: it's
possible that Bram nixed it. You might snoop around the mailing list
archives to see if there's anything to dig up.

Note that none of these things are bugs, they're enhancements. It may be
that Blueprints is a more appropriate place to track this, but I'm not
really sure. If the bug-tracker's appropriate for these issues, then
this should probably be split apart for the three different issues. If
this one is reopened against screen, the title should be changed, as
screen isn't actually catching or transforming anything: it's passing
the escape sequence through as-is, without modification.

Hope that helps.

-- 
Screen mistakingly catches Control-PgUp Control-PgDown
https://bugs.launchpad.net/bugs/82708
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