Bug 494301

Created attachment 174539 [details]
Screenshot of the artifact

SUMMARY

Scrolling the terminal while colored texts are on the screen while using the Monocraft font version 1.4 (https://github.com/IdreesInc/Monocraft/releases/tag/v1.4) sometimes leaves 1-pixel-thick artifacts on the left side of the window. I don't know if this is the only font that does this, but I have tried using other fonts, and this doesn't happen.

STEPS TO REPRODUCE
1.  Change the font to Monocraft. I have only confirmed that version 1.4 causes the artifact.
2.  Use a command that produces colored characters and scroll the terminal. I think having more colored characters on screen makes this happen more. Note that this is really inconsistent and the artifact only appears sometimes.
3. See colored 1-pixel thick lines appear on the left side of the screen. (I don't know if the artifact lines are only ever blue, but so far they've only been blue)

OBSERVED RESULT

See attachment.

EXPECTED RESULT

No artifact.

SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.15
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.6.51-gentoo-dist (64-bit)
Graphics Platform: X11
Processors: 8 × 11th Gen Intel® Core™ i7-11370H @ 3.30GHz
Memory: 15.3 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics