cosmic-term does not render btop++ correctly

[joske]

All other terminals I've tried (wezterm, kitty, gnome-terminal, alacritty, ...) render it correctly, so it's a cosmic-term issue.

Screenshot below is from running in GNOME, but it was the same in cosmic (installed from AUR today).

[joske]

BTW, htop and top do render correctly, so not sure what btop is doing to render so badly.

[RossBarnie]

Likely a duplicate of aristocratos/btop#890 with one user reporting the same issue in GNOME terminal, so may not be a cosmic-specific issue. I had a look through alacritty issues and couldn't see anything related.

[joske]

No issues in GNOME terminal here. I also noticed that the nvim splash screen of astronvim also renders wonky in cosmic-term.

[gaspatxo]

I have the same issue with btm

─$fastfetch
             /////////////                 xxx@pop-os
         /////////////////////             ----------
      ///////*767////////////////          OS: Pop!_OS jammy 22.04 x86_64
    //////7676767676*//////////////        Host: 81LK (IdeaPad L340-15IRH Gaming)
   /////76767//7676767//////////////       Kernel: Linux 6.9.3-76060903-generic
  /////767676///*76767///////////////      Uptime: 6 hours, 46 mins
 ///////767676///76767.///7676*///////     Packages: 4504 (dpkg), 18 (flatpak-user)
/////////767676//76767///767676////////    Shell: bash 5.1.16
//////////76767676767////76767/////////    Display (CMN15E7): 1920x1080 @ 60 Hz in 16″ [External]
///////////76767676//////7676//////////    DE: GNOME 42.9
////////////,7676,///////767///////////    WM: Mutter (X11)
/////////////*7676///////76////////////    WM Theme: Orchis-Dark
///////////////7676////////////////////    Theme: plastique [Qt], adw-gtk3-dark [GTK2/3/4]
 ///////////////7676///767////////////     Icons: Tela-blue [Qt], Papirus-Dark [GTK2/3/4]
  //////////////////////'////////////      Font: qt5ct [Qt], Open Sans (10pt, Light) [GTK2/3/4]
   //////.7676767676767676767,//////       Cursor: phinger-cursors-light (24px)
    /////767676767676767676767/////        Terminal: x-terminal-emulator
      ///////////////////////////          CPU: Intel(R) Core(TM) i7-9750HF (12) @ 4.50 GHz
         /////////////////////             GPU: NVIDIA GeForce GTX 1650 Mobile / Max-Q [Discrete]
             /////////////                 Memory: 7.16 GiB / 15.53 GiB (46%)
                                           Swap: 768.00 KiB / 19.53 GiB (0%)
                                           Disk (/): 680.52 GiB / 928.94 GiB (73%) - ext4
                                           Disk (/recovery): 2.85 GiB / 3.99 GiB (71%) - vfat
                                           Local IP (tun0): 10.2.18.105/24
                                           Battery: 25% [Discharging]
                                           Locale: en_US.UTF-8

[hbacelar8]

Maye it's the font? Since we cant set custom fonts...

[MoSal]

If possible, install a monospace font with braille support like iosevka and report back.

[joske]

Tried several monospace fonts, but it does not make any difference. Even with fonts that I know work in other terminals.

[MoSal]

@joske Not everything necessarily gets rendered by the font you select. And the font fallback process is different as other terminals may use fontconfig, I think, while COSMIC uses a completely different text stack. Also, COSMIC doesn't do stuff like resizing individual rendered characters to a monospace width (which is a known source of broken rendering for any joined script in other terminals).

Did you try installing the iosevka font? You don't have to select it. It should be automatically picked as a fallback for the characters it supports.

[joske]

After installing iosevka font, btop renders correctly. However, the nvim splash screen still doesn't.

[drazil100]

I also have this issue.

[RedBearAK]

There was an issue like this in years past that pretty much exclusively seemed to happen in Konsole. I believe it was also a font fallback problem.

Installing the Iosevka font as suggested cured the misalignments for me in cosmic-term. I did not have to select it, the selected font is still a version of Fantasque Sans Mono with no ligatures, no loop-K, large line height, that has been converted with the Nerd Font script. I use it on every platform I can. Many different desktop environments and terminal apps.

So I guess the theory is that the braille characters before installing Iosevka were coming from a fallback font with bad character alignment for those characters, or just was not a monospace font, or something like that. (I don't know that much about how fonts work.)

Pretty weird though, how you could briefly see the lines extending off to the right of the main terminal area if you expanded the cosmic-term window to the right. The lines are fully rendering, just mostly being hidden behind the right edge of the window border.

[jackpot51]

The main issue has been identified by others and I want to state it plainly and clearly:

The default braille font does not fit properly into the grid cells of the default monospace font, causing it to push future characters to the right and break alignment.

[drazil100]

After bricking my system (tried to do a system update with the systemd-sysext method of running cosmic so I disabled that service and cosmic froze mid update) I finally got up and running and was able to install this font. It DID fix the issue but it still looks pretty off. Not sure if it has to do with my 1366x768p display, the fractional scaling I applied in .local/state or what but there shouldn't be spaces between the lines.

For reference this is what it is supposed to look like

Btw don't worry I didn't lose anything important in the bricking other than 3 days of compile time on cosmic-sysexe. I am running pop now :)

[RedBearAK]

@drazil100

I see the gaps in the same way on a mini PC with COSMIC desktop installed on Fedora 40. The Iosevka font fixes the misalignment from the braille characters, but there's still some misalignment on a couple of lines where a large filled triangle graphic character keeps replacing a smaller filled triangle, in the network box.

Strangely, I don't see the gaps in a virtual machine with the same Fedora 40 and COSMIC combination. But there are a few gaps in a virtual machine with Pop!_OS 24.04 LTS alpha.

Maybe there needs to be another default font to fix the graphical shape characters.

[leviport]

Potential duplicate of pop-os/cosmic-text#237

[sohrob]

I have this same issue with bottom.

[leviport]

Bug is pop-os/cosmic-text#237

Locking thread to consolidate discussion into a single issue