D27380: [GTK Config] Write Font without style name

[Mikhail Zolotukhin]

gikari created this revision.
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REVISION SUMMARY
  It has been reported, that on localized systems
  the font style was written in local language.
  Therefore config line was incorrectly read by
  GTK and therefore applications displayed bad
  font. To avoid that this commit is introduced.
  
  This is not an ideal solution, because the selected
  font style in font dialog will be ignored by GTK applications.
  However, there is a workaround for that: you need to select a
  font with the style in its family name. For example: "Inter"
  with style "Medium" will be "Inter Medium". But some styles
  do not have these "clones", e.g. Regular, Bold and Italic.
  
  At least ignored style with very easy workaround is better, than
  no ability to correctly apply a font at all with a very tedious
  workaround aka "manually editing a lot of GTK config files and options".

TEST PLAN
  1. Apply fonts with style and see, that it is not propagated to GTK configs.
  2. Apply fonts with the same styles in their family name to see, that they are working correctly.

REPOSITORY
  R99 KDE Gtk Configuration Tool

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27380

AFFECTED FILES
  kded/configvalueprovider.cpp

To: gikari
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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