colors #8-16 are not bright

[Alain Bench]

Hello,

    I have a problem to display colors #8 to #15 in Screen 4.0.2 on a
PuTTY 0.58 terminal. What gets displayed is color number minus 8: The
dark colors #0 to #7.

    Example: In PuTTY I export TERM=putty-256color, and have added such
a customized entry to my system terminfo database from
Ncurses-5.5-20060128 (latest rollup patch). It notably contains:

| putty-256color|PuTTY terminal emulator (v0.58 with 256 colors), 
|       colors#256, pairs#32767, 
|       setab=\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%p1%d%;m, 
|       setaf=\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m, 
|       use=putty, 

    In straight PuTTY I get the expected bright blue ink^W foreground
when doing any of:

| $ tput setaf 12 ; echo brightblue     # this sends ESC[94m
| $ printf "\033[94m brightblue"        # color #12 in  16 colors scheme
| $ printf "\033[38;5;12m brightblue"   # color #12 in 256 colors scheme

    But in Screen, for both 16 and 256 colors schemes, I get dark blue,
color #4. To analyse what happens I first start "script", then Screen,
and finaly look at the generated typescript file. I can see that Screen
translated my escape sequences: When I type in Screen printf "\033[94m"
or printf "\033[38;5;12m", Screen sends to PuTTY ESC[34m (color #4).

    The same happens with an underlying TERM=putty-16color entry, and
with many entries declaring 16 or more colors. The same happens with or
without ./configure --enable-colors256 option. And the same happens with
any TERM exported inside Screen.

    OTOS the problem disappears if the underlying TERM name begins by
"xterm" or "rxvt", even if it's a faked alias to my own "putty-*color"
entry. Colors #8 to #15 are then bright. Exactly Screen then sends to
PuTTY ESC[34mESC[94m (color #4 then #12), which wastes some bytes, but
has the desired bright effect.


    Is that dark #8-15 colors a bug? And is there a solution or
workaround sufficiently generic to work with any terminals having 16 or
more colors? Please note that I'm not familiar with Screen: I built it
just to check this problem that was reported to me. My ~/.screenrc is
nearly empty: defbce on and startup_message off only.


Bye!    Alain.
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