[systemsettings] [Bug 376630] New: Bold font rendering is broken after changing font via kcm_fonts

[Pulfer]

https://bugs.kde.org/show_bug.cgi?id=376630

            Bug ID: 376630
           Summary: Bold font rendering is broken after changing font via
                    kcm_fonts
           Product: systemsettings
           Version: 5.9.2
          Platform: ROSA RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: kcm_fonts
          Assignee: unassigned-bugs at kde.org
          Reporter: pulfer at list.ru
                CC: unassigned-bugs at kde.org
  Target Milestone: ---

Created attachment 104102
  --> https://bugs.kde.org/attachment.cgi?id=104102&action=edit
KDE 4 vs Plasma 5 bold font in Dolphin

Since some time kcm_fonts writes "font=Liberation Sans,10,-1,5,50,0,0,0,0,0,
Regular" instead of "font=Liberation Sans,10,-1,5,50,0,0,0,0,0" to kdeglobals.
So it breaks bold font rendering in System Settings, Dolphin url bar and some
other places. The font is bold but gets a kind of blur. Removing ", Regular"
from kdeglobals fixes font rendering.

See the attached screenshot for System Settings (guest) and Dolphin/KF5 (guest)
VS Dolphin/KDE4 (host) font rendering comparison.

Maybe QFont() return format changed in Qt 5.7 or 5.8, that's why extra
"Regular" is added to font settings. Just my quick guess.

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