[Bug] Last character leaves a trail when scrolling the list with .Xresource based terminal

[fsc0]

Checklist

• I have read through the manual page (man fzf)
• I have searched through the existing issues
• For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.57.0

OS

• Linux
• macOS
• Windows
• Etc.

Shell

• bash
• zsh
• fish

Problem / Steps to reproduce

This bug is reproducible with st, xterm, rxvt-unicode,
But not with kitty, alacritty.

Did test with default .Xresource setting.

Tested on Void Linux 6.12.6_3.

[fsc0]

dummy-UTF-8.txt

I did further research and realized the encoding of that dummy.txt on gif demo was UTF-8,
And bug couldn't reproduce with ASCII.

EDIT: Upload dummy-UTF-8.txt

[fsc0]

hny.txt

If the last character of the line is CJK character, bug can't reproduce.
And the trail leaving the mark all over previous lines passed.

Related: #1526, #2020
Issue #2194, conditions are quiet different but quite similar.

EDIT: Further info

[fsc0]

Thanks for the info @y0ast
#1526 (comment)

fzf/src/terminal.go

Line 2174 in fe3a9c6

t.window.CPrint(color, strings.Repeat(" ", fillSpaces))

t.window.CPrint(color, strings.Repeat(" ", 2 * fillSpaces)) 

fzf/src/terminal.go

Line 2188 in fe3a9c6

t.window.Print(strings.Repeat(" ", fillSpaces))

t.window.Print(strings.Repeat(" ", 2 * fillSpaces))

But scrollbar not displaying properly, and layout broken with some options like header.