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

[Lucas Pires Camargo]

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

--- Comment #187 from Lucas Pires Camargo <lucaspcamargo at gmail.com> ---
Whoops. I posted midway on accident.

(In reply to Lastique from comment #185)
> I know nothing about how the code works, but doesn't incrementing height
> have the potential to corrupt the surrounding previously rendered content
> when the increment is not needed?

That's right. And it does. That's why I said this patch is not suitable for
merging. But it might be helpful for people like me that are willing to trade
whole-window artifacts for slightly incorrect rendering of text with colored
backgrounds. For most people using fractional scaling, I guess that the
off-by-one pixel artifacts are much less jarring.

I guess what I really need to do is test with the latest Qt and attempt a
proper fix from that. I'll try to figure that out. If anyone can point out to
me how to do that (CMake arguments for konsole?) that'd be much appreciated.

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