D21524: Keep existing configurations' strings

[Mikhail Zolotukhin]

gikari created this revision.
Herald added a project: Plasma.
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gikari requested review of this revision.

REVISION SUMMARY
  Gtk configurator has been replacing .gtkrc-2.0 config file,     
  with it's own settings, discarding present file contents.    
  Now it only modifies configuration strings, or add them if      
  they are not present at the beginning of the file.
  
  This patch also removes redundant configurations, such as    
  including theme from /usr/share/themes gtkrc's, "user-font"  
  style, widget_class and unneeded symlink .gtkrc-2.0-kde4.
  Those options do not seem needed, as gtk2 applications    
  look the same without these options without any regressions.  
  This was tested on Gimp, Inkscape and BleachBit apps on Manjaro,
  OpenSUSE and KDE Neon distributions.
  
  As for gtk3 ini file - this is not reproducible anymore,  
  any line, which does not hold parameter changeable in   
  configurator, remains in settings.ini.
  
  BUG: 322797
  BUG: 354963
  BUG: 342320

REPOSITORY
  R99 KDE Gtk Configuration Tool

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D21524

AFFECTED FILES
  src/appearancegtk2.cpp
  src/appearancegtk2.h

To: gikari
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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