The console supports the escape codes for half-brite and underline,
but uses a different colour rather than different glyphs.
When I do M-x list-faces-display, the output for `underline' seems to
be identical to the default.
Using:
env TERM=xterm emacs -nw
they both work as expected.
When I try that, the underline face comes out as bold.
I would guess that the difference in behavior is due to a difference
in the terminfo specs. The terminfo specs for type `linux' may
be erroneous. Could someone check that?
However, given that Emacs can ask for the same result as "bold", it
would probably be better for display-supports-face-attributes-p to
honestly report that this terminal does not really support
underlining. It should return nil for both `linux' and `xterm'.
If we want to preserve the current behavior of the face `underline'
for type `xterm' (and maybe extend it to type `linux'), it could
specify bold for terminals that support bold but not underline.
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