[konsole] [Bug 488505] New: Pixel from underlined characters at leftmost screen edge remains when clearing terminal or switching to alternative screen

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=488505

            Bug ID: 488505
           Summary: Pixel from underlined characters at leftmost screen
                    edge remains when clearing terminal or switching to
                    alternative screen
    Classification: Applications
           Product: konsole
           Version: 24.05.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: nilskemail+kde at gmail.com
  Target Milestone: ---

Created attachment 170503
  --> https://bugs.kde.org/attachment.cgi?id=170503&action=edit
Console capture showing several white pixel artifacts at the left edge

SUMMARY
When the leftmost character in a line has an underline, a sliver of that
underline remains after calling clear or switching to an alternative screen
(e.g. nano, less)

STEPS TO REPRODUCE
1. Open Konsole
2. Run 'printf "\e[4munderline\e[0m\n"'
3. Open nano, or run 'echo | less'

OBSERVED RESULT
A few pixels at the leftmost edge remain and are not cleared

EXPECTED RESULT
There should be no remaining artifacts of the character underline

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.8.11-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon 780M Graphics
Memory: 30.7 GiB of RAM
Graphics Processor: AMD Radeon 780M
Manufacturer: Framework
Product Name: Laptop 13 (AMD Ryzen 7040Series)
System Version: A7

ADDITIONAL INFORMATION
The artifacts only sometimes appear when calling  'clear'. Nano and less seem
more consistent.
The artifacts also disappear once a different window has the focus (this can be
as simple as pressing the Meta key open the start menu, so covering the window
is not necessary).
My screen has fractional scaling, maybe that has an impact on this.

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