KConfig will clear the styleName font property for "Regular"-like font
styles (so that setBold(true) can work properly); this means that when
opening the font selection dialog it may highlight the wrong style for
the font currently set in kdeglobals, i.e. if the styleName property is
empty, QFontDialog will always select the first style in the list.

Workaround the issue by setting the "Regular"-like font style of the
initial font.

adjustAllFonts() doesn't take any arguments, change the QML code accordingly.

Depends on D27808
Depends on D27785

See also https://phabricator.kde.org/D27735 (KConfig)

• Apply this diff and the other two it depends on
• Edit kdeglobals and remove ",Regular|Normal|Book|Roman" from the *font*= entries; append e.g. ",Bold" to one of those entries (pick a font family that has a bold style)
• Open the fonts kcm, and open the font selection dialog for a font, the correct "Regular"-like style should be selected
• Open the font selection dialog for the font you set as Bold; Bold should be highlighted
• Open the "Adjust all fonts" dialog, again the correct style should be selected