Re: xsrc/60398 (Line drawing in xterm does not work as expected)

To: gnats-bugs%netbsd.org@localhost, riastradh%NetBSD.org@localhost
Subject: Re: xsrc/60398 (Line drawing in xterm does not work as expected)
From: Havard Eidnes <he%NetBSD.org@localhost>
Date: Fri, 03 Jul 2026 14:15:32 +0200 (CEST)
> 1. Can you please start a fresh xterm in each version of NetBSD you
>    tried, started however you normally start xterms, and share the
>    output of `locale' in each fresh xterm?

I usually don't mess with things I don't have to, so they all
have

$ locale
LANG=""
LC_CTYPE="C"
LC_COLLATE="C"
LC_TIME="C"
LC_NUMERIC="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_ALL=""
$ 

I also have Alt-B and Alt-F committed to muscle memory as usable
line editing characters in tcsh, and if I'm not terribly mistaken,
those are no longer usable in a locale containing UTF-8, and are
instead interpreted as Something Else.

> 2. Can you share any .Xdefaults or .Xresources file you have?
>
> 3. Can you share the output of `xrdb -q'?

These come down to basically the same:

$ xrdb -q | egrep -i xterm
XTerm*ScrollBar:        true
XTerm*scrollbar*thickness:      7
XTerm*multiScroll:      true
XTerm*saveLines:        1000
XTerm*scrollInput:      false
XTerm*scrollKey:        true
XTerm*visualBell:       true
XTerm*cursorColor:      violet red
xterm.waitforwm:        false
XTerm*background:       bisque
XTerm*foreground:       black
XTerm*deleteIsDEL:      true
XTerm*ptyInitialErase:  true
XTerm*ttyModes: erase ^?
XTerm*numLock:  false
XTerm*backarrowKeyIsErase:      true
XTerm*backarrowKey:     true
$ 

> 4. Can you share the output of `appres XTerm'?

$ appres XTerm
*tekMenu*vtshow*Label:  Show VT Window
*tekMenu*tektextsmall*Label:    Small Characters
*tekMenu*vtmode*Label:  Switch to VT Mode
*tekMenu*tektextlarge*Label:    Large Characters
*tekMenu*tekpage*Label: PAGE
*tekMenu*tekreset*Label:        RESET
*tekMenu*tektext2*Label:        #2 Size Characters
*tekMenu*tekhide*Label: Hide Tek Window
*tekMenu*tekcopy*Label: COPY
*tekMenu*tektext3*Label:        #3 Size Characters
*tekMenu.Label: Tek Options
*MenuButton*borderWidth:        0
*menubar.borderWidth:   0
*mainMenu*redraw*Label: Redraw Window
*mainMenu*oldFunctionKeys*Label:        Old Function-Keys
*mainMenu*interrupt*Label:      Send INT Signal
*mainMenu*8-bit control*Label:  8-Bit Controls
*mainMenu*logging*Label:        Log to File
*mainMenu*sunFunctionKeys*Label:        Sun Function-Keys
*mainMenu*hangup*Label: Send HUP Signal
*mainMenu*print-immediate*Label:        Print-All Immediately
*mainMenu*sunKeyboard*Label:    VT220 Keyboard
*mainMenu*terminate*Label:      Send TERM Signal
*mainMenu*backarrow key*Label:  Backarrow Key (BS/DEL)
*mainMenu*print-on-error*Label: Print-All on Error
*mainMenu*hpFunctionKeys*Label: HP Function-Keys
*mainMenu*kill*Label:   Send KILL Signal
*mainMenu*num-lock*Label:       Alt/NumLock Modifiers
*mainMenu*toolbar*Label:        Toolbar
*mainMenu*print*Label:  Print Window
*mainMenu*scoFunctionKeys*Label:        SCO Function-Keys
*mainMenu*quit*Label:   Quit
*mainMenu*alt-esc*Label:        Alt Sends Escape
*mainMenu*print-redir*Label:    Redirect to Printer
*mainMenu*fullscreen*Label:     Full Screen
*mainMenu*tcapFunctionKeys*Label:       Termcap Function-Keys
*mainMenu*meta-esc*Label:       Meta Sends Escape
*mainMenu*dump-html*Label:      XHTML Screen Dump
*mainMenu*securekbd*Label:      Secure Keyboard
*mainMenu*suspend*Label:        Send STOP Signal
*mainMenu*dump-svg*Label:       SVG Screen Dump
*mainMenu*allowsends*Label:     Allow SendEvents
*mainMenu*delete-is-del*Label:  Delete is DEL
*mainMenu*continue*Label:       Send CONT Signal
*mainMenu.Label:        Main Options
*tek4014*fontLarge:     9x15
*tek4014*font2: 8x13
*tek4014*font3: 6x13
*tek4014*fontSmall:     6x10
*SimpleMenu*menuLabel.font:     -adobe-helvetica-bold-r-normal--*-120-*-*-*-*-iso8859-*
*SimpleMenu*menuLabel.vertSpace:        100
*SimpleMenu*Sme.height: 16
*SimpleMenu*BackingStore:       NotUseful
*SimpleMenu*HorizontalMargins:  16
*SimpleMenu*Cursor:     left_ptr
*SimpleMenu*borderWidth:        2
*fontMenu*allow-bold-fonts*Label:       Bold Fonts
*fontMenu*font2*Label:  Tiny
*fontMenu*utf8-title*Label:     UTF-8 Titles
*fontMenu*font-linedrawing*Label:       Line-Drawing Characters
*fontMenu*font3*Label:  Small
*fontMenu*allow-color-ops*Label:        Allow Color Ops
*fontMenu*font-doublesize*Label:        Doublesized Characters
*fontMenu*font4*Label:  Medium
*fontMenu*allow-font-ops*Label: Allow Font Ops
*fontMenu*font-loadable*Label:  VT220 Soft Fonts
*fontMenu*font5*Label:  Large
*fontMenu*allow-mouse-ops*Label:        Allow Mouse Ops
*fontMenu*font-packed*Label:    Packed Font
*fontMenu*fontdefault*Label:    Default
*fontMenu*font6*Label:  Huge
*fontMenu*allow-tcap-ops*Label: Allow Termcap Ops
*fontMenu*render-font*Label:    TrueType Fonts
*fontMenu*font1*Label:  Unreadable
*fontMenu*font7*Label:  Enormous
*fontMenu*allow-title-ops*Label:        Allow Title Ops
*fontMenu*utf8-mode*Label:      UTF-8 Encoding
*fontMenu*fontescape*Label:     Escape Sequence
*fontMenu*allow-window-ops*Label:       Allow Window Ops
*fontMenu*fontsel*Label:        Selection
*fontMenu*utf8-fonts*Label:     UTF-8 Fonts
*fontMenu.Label:        VT Fonts
*vtMenu*keepSelection*Label:    Keep Selection
*vtMenu*autowrap*Label: Enable Auto Wraparound
*vtMenu*titeInhibit*Label:      Enable Alternate Screen Switching
*vtMenu*altscreen*Label:        Show Alternate Screen
*vtMenu*keepClipboard*Label:    Keep Clipboard
*vtMenu*reversewrap*Label:      Enable Reverse Wraparound
*vtMenu*activeicon*Label:       Enable Active Icon
*vtMenu*sixelScrolling*Label:   Sixel Scrolling
*vtMenu*selectToClipboard*Label:        Select to Clipboard
*vtMenu*autolinefeed*Label:     Enable Auto Linefeed
*vtMenu*softreset*Label:        Do Soft Reset
*vtMenu*privateColorRegisters*Label:    Private Color Registers
*vtMenu*cursesemul*Label:       Enable Curses Emulation
*vtMenu*scrollbar*Label:        Enable Scrollbar
*vtMenu*appcursor*Label:        Enable Application Cursor Keys
*vtMenu*hardreset*Label:        Do Full Reset
*vtMenu*visualbell*Label:       Enable Visual Bell
*vtMenu*appkeypad*Label:        Enable Application Keypad
*vtMenu*clearsavedlines*Label:  Reset and Clear Saved Lines
*vtMenu*bellIsUrgent*Label:     Enable Bell Urgency
*vtMenu*scrollkey*Label:        Scroll to Bottom on Key Press
*vtMenu*tekshow*Label:  Show Tek Window
*vtMenu*scrollttyoutput*Label:  Scroll to Bottom on Tty Output
*vtMenu*jumpscroll*Label:       Enable Jump Scroll
*vtMenu*poponbell*Label:        Enable Pop on Bell
*vtMenu*tekmode*Label:  Switch to Tek Mode
*vtMenu*allow132*Label: Allow 80/132 Column Switching
*vtMenu*reversevideo*Label:     Enable Reverse Video
*vtMenu*cursorblink*Label:      Enable Blinking Cursor
*vtMenu*vthide*Label:   Hide VT Window
*vtMenu.Label:  VT Options
*form.Thickness:        0
*VT100.utf8Fonts.font4: -misc-fixed-medium-r-normal--13-120-75-75-c-80-iso10646-1
*VT100.utf8Fonts.font2: -misc-fixed-medium-r-normal--8-80-75-75-c-50-iso10646-1
*VT100.utf8Fonts.font6: -misc-fixed-medium-r-normal--20-200-75-75-c-100-iso10646-1
*VT100.utf8Fonts.font5: -misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1
*VT100.utf8Fonts.font3: -misc-fixed-medium-r-normal--14-130-75-75-c-70-iso10646-1
*VT100.utf8Fonts.font:  -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1
*VT100.utf8Fonts.font7: -adobe-courier-medium-r-normal--24-240-75-75-m-150-iso10646-1
*VT100.font4:   7x13
*VT100.font2:   5x7
*VT100.font6:   10x20
*VT100.font5:   9x15
*VT100.font3:   6x10
*VT100.font1:   nil2
*VT100.font7:   -adobe-courier-medium-r-normal--24-240-75-75-m-150-iso10646-1
XTerm*scrollbar*thickness:      7
XTerm*scrollKey:        true
XTerm*ptyInitialErase:  true
XTerm*backarrowKey:     true
XTerm*background:       bisque
XTerm*visualBell:       true
XTerm*multiScroll:      true
XTerm*ttyModes: erase ^?
XTerm*foreground:       black
XTerm*cursorColor:      violet red
XTerm*ScrollBar:        true
XTerm*saveLines:        1000
XTerm*numLock:  false
XTerm*scrollInput:      false
XTerm*deleteIsDEL:      true
XTerm*backarrowKeyIsErase:      true
*saveLines:     1024
*IconFont:      nil2
*allowWindowOps:        false
*pointerMode:   0
$ 

> When I try running `LC_CTYPE=C xterm' vs `LC_CTYPE=C.UTF-8
> xterm', on netbsd-9 and netbsd-10 userlands, I am able to
> reproduce exactly what you described: with LC_CTYPE=C, xterm
> shows a-with-circumflex; with LC_CTYPE=C.UTF-8, xterm shows
> vertical bar.

If I start xterm on netbsd-9 and netbsd-10 without any LANG or
LC_CTYPE in the environment, bring up the font menu and select
"UTF-8 Encoding", I get line drawing characters for the UTF-8
sequences for those characters in that xterm.

If I do the same on netbsd-11, I do not.  Evidently with that
version, xterm *must* be started in an environment / locale setting
which includes UTF-8 for that to work, and in that case the font
menu entries related to UTF-8 are greyed out in the newly started
xterm.

So ... in the new xterm version, the dynamic choice of "UTF-8
Encoding" no longer appears to be possible.

So ... in a sense I now have a workaround.

Regards,

- Havard
References:
- Re: xsrc/60398 (Line drawing in xterm does not work as expected)
  - From: riastradh
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