[konsole] [Bug 373232] Horizontal lines with fractional HiDPI scaling

[Postix]

https://bugs.kde.org/show_bug.cgi?id=373232

--- Comment #95 from Postix <postix at posteo.eu> ---
I think I may have tracked it down a little bit in the source code:

In TerminalDisplay.cpp of Konsole it says
> 674: painter.fillRect(rect, color);
> 678: painter.fillRect(rect, backgroundColor);

If you comment out both, no background is drawn, but I also don't see any more
horizontal or vertical lines (the latter in mc). 

When I set the first rect fixed to (0,0,100,20) for example and made a
selection of the content or scrolled up and down to provoke those lines, the
horizontal line was only drawn over the painted rect.

Maby that's a starting point for further investigations. ;-)


## System

Operating System: Manjaro Linux 
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.58.0
Qt Version: 5.12.3
Kernel Version: 5.1.4-1-MANJARO
Konsole: Master (926bc5715448bf62ad6060e64aef7c5c5e1d51f0)

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