[konsole] [Bug 403106] New: Invalid rendering of borders in Midnight Commander under Konsole 18.12

[Michal Ziabkowski]

https://bugs.kde.org/show_bug.cgi?id=403106

            Bug ID: 403106
           Summary: Invalid rendering of borders in Midnight Commander
                    under Konsole 18.12
           Product: konsole
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: mziab at o2.pl
  Target Milestone: ---

Created attachment 117404
  --> https://bugs.kde.org/attachment.cgi?id=117404&action=edit
The incorrect rendering of mc using Konsole 18.12.0

After upgrading to Konsole 18.12.0, I noticed that window borders in Midnight
Commander were being rendered incorrectly. What I mean by that they are more
squiggly instead of straight lines. Downgrading to 18.08.3 fixes the issue, so
this seems like a regression introduced with the emoji support. To better
explain what I mean I've attached screenshots of how it looked like in 18.08
and how it looks now.

Though it shouldn't matter, the font I use is DejaVu Sans Mono. Midnight
Commander is version 4.8.21 with Unicode support. The problem is present using
other appearance presets in Konsole.

I've ruled out it being a problem with Midnight Commander, as it's still
present after removing the mc config. For testing purposes I also ran mc with
LC_ALL=C, but this didn't change the rendering.

Package versions used:

Konsole 18.12.0
Qt 5.11.3
Plasma 5.14.5
KDE Frameworks 5.53.0

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