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

[Potomac]

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

--- Comment #171 from Potomac <mister.freeman at laposte.net> ---
(In reply to Christoph Feck from comment #170)
> Potomac, are you sure it was a Plasma update that broke it? The net is full
> of font rendering regression reports since Qt was updated to version 5.14.0.

Yes, the problem started with the update of plasma (5.17.4 to 5.17.5) and KDE
softwares (19.12.0 -> 19.12.1),

on these new versions the "high dpi support" has been enabled by kde
developers, which triggers problems on my configuration (24 inch monitor
1920x1080, DPI 96, graphic card : amd radeon HD4650 pcie, radeon driver open
source) :

+    // enable high dpi support
+    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
+

https://cgit.kde.org/konsole.git/commit/?id=54820e0ff2745add8b8353f538ad67d66b657d49

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