GNU bug report logs - #78807
31.0.50; Wave underline set wrongly

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From: Ergus <spacibba <at> aol.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: "78807 <at> debbugs.gnu.org" <78807 <at> debbugs.gnu.org>
Subject: bug#78807: 31.0.50; Wave underline set wrongly
Date: Sun, 22 Jun 2025 01:44:39 +0000 (UTC)

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 Hi Eli:

As far as I know the check for wave underline in terminfo may look for Smulx
I tried: `infocmp -1 | grep -E 'Smulx|Su|cul'` 

and: `tigetstr("Smulx")` in a C snippet 
and none of them return positive.
The function mentions that it uses some heuristics and that may be the problem?

this is my infocmp output in case it helps:
```# Reconstructed via infocmp from file: /usr/share/terminfo/t/tmux-256colortmux-256color|tmux with 256 colors,am, hs, km, mir, msgr, xenl,colors#0x100, cols#80, it#8, lines#24, pairs#0x10000,acsc=++\,\,--..00``aaffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,bel=^G, blink=\E[5m, bold=\E[1m, cbt=\E[Z, civis=\E[?25l,clear=\E[H\E[J, cnorm=\E[34h\E[?25h, cr=\r,csr=\E[%i%p1%d;%p2%dr, cub=\E[%p1%dD, cub1=^H,cud=\E[%p1%dB, cud1=\n, cuf=\E[%p1%dC, cuf1=\E[C,cup=\E[%i%p1%d;%p2%dH, cuu=\E[%p1%dA, cuu1=\EM,cvvis=\E[34l, dch=\E[%p1%dP, dch1=\E[P, dim=\E[2m,dl=\E[%p1%dM, dl1=\E[M, dsl=\E]0;\007, ed=\E[J, el=\E[K,el1=\E[1K, enacs=\E(B\E)0, flash=\Eg, fsl=^G, home=\E[H,hpa=\E[%i%p1%dG, ht=^I, hts=\EH, ich=\E[%p1%d@,il=\E[%p1%dL, il1=\E[L, ind=\n, indn=\E[%p1%dS,invis=\E[8m, is2=\E)0, kDC=\E[3;2~, kEND=\E[1;2F,kHOM=\E[1;2H, kIC=\E[2;2~, kLFT=\E[1;2D, kNXT=\E[6;2~,kPRV=\E[5;2~, kRIT=\E[1;2C, kbs=^?, kcbt=\E[Z, kcub1=\EOD,kcud1=\EOB, kcuf1=\EOC, kcuu1=\EOA, kdch1=\E[3~,kend=\E[4~, kf1=\EOP, kf10=\E[21~, kf11=\E[23~,kf12=\E[24~, kf13=\E[1;2P, kf14=\E[1;2Q, kf15=\E[1;2R,kf16=\E[1;2S, kf17=\E[15;2~, kf18=\E[17;2~,kf19=\E[18;2~, kf2=\EOQ, kf20=\E[19;2~, kf21=\E[20;2~,kf22=\E[21;2~, kf23=\E[23;2~, kf24=\E[24;2~,kf25=\E[1;5P, kf26=\E[1;5Q, kf27=\E[1;5R, kf28=\E[1;5S,kf29=\E[15;5~, kf3=\EOR, kf30=\E[17;5~, kf31=\E[18;5~,kf32=\E[19;5~, kf33=\E[20;5~, kf34=\E[21;5~,kf35=\E[23;5~, kf36=\E[24;5~, kf37=\E[1;6P, kf38=\E[1;6Q,kf39=\E[1;6R, kf4=\EOS, kf40=\E[1;6S, kf41=\E[15;6~,kf42=\E[17;6~, kf43=\E[18;6~, kf44=\E[19;6~,kf45=\E[20;6~, kf46=\E[21;6~, kf47=\E[23;6~,kf48=\E[24;6~, kf49=\E[1;3P, kf5=\E[15~, kf50=\E[1;3Q,kf51=\E[1;3R, kf52=\E[1;3S, kf53=\E[15;3~, kf54=\E[17;3~,kf55=\E[18;3~, kf56=\E[19;3~, kf57=\E[20;3~,kf58=\E[21;3~, kf59=\E[23;3~, kf6=\E[17~, kf60=\E[24;3~,kf61=\E[1;4P, kf62=\E[1;4Q, kf63=\E[1;4R, kf7=\E[18~,kf8=\E[19~, kf9=\E[20~, khome=\E[1~, kich1=\E[2~,kind=\E[1;2B, kmous=\E[M, knp=\E[6~, kpp=\E[5~,kri=\E[1;2A, nel=\EE, op=\E[39;49m, rc=\E8, rev=\E[7m,ri=\EM, rin=\E[%p1%dT, ritm=\E[23m, rmacs=^O,rmcup=\E[?1049l, rmir=\E[4l, rmkx=\E[?1l\E>, rmso=\E[27m,rmul=\E[24m, rs2=\Ec\E[?1000l\E[?25h, sc=\E7,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,sgr=\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;%?%p5%t;2%;%?%p7%t;8%;m%?%p9%t\016%e\017%;,sgr0=\E[m\017, sitm=\E[3m, smacs=^N, smcup=\E[?1049h,smir=\E[4h, smkx=\E[?1h\E=, smso=\E[7m, smul=\E[4m,tbc=\E[3g, tsl=\E]0;, u6=\E[%i%d;%dR, u7=\E[6n,u8=\E[?1;2c, u9=\E[c, vpa=\E[%i%p1%dd,```
Best,Ergus

    On Monday, June 16, 2025 at 06:17:26 PM GMT+2, Eli Zaretskii <eliz <at> gnu.org> wrote:   

 > Date: Mon, 16 Jun 2025 17:41:18 +0200
> From:  Ergus via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> I am using emacs on tmux, which does not support wave underline (it
> prints it as normal text)
> 
> echo -e "\e[4:3mThis is normal text in tmux\e[0m"
> 
> When I try
> 
> (display-supports-face-attributes-p '(:underline (:style wave)))
> 
> it returns t, which for tmux it seems like it shouldn't.
> 
> So this makes that faces like `flyspell-incorrect` look like normal text
> and no highlight is visible at all.

I suggest to report this to the developers of tmux: they should make
sure the terminfo entry correctly reflects the actual capabilities
they support.  As you can see in tty_capable_p, Emacs just looks at
the capabilities reported by terminfo.
  

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