D26375: Respect GTK2_RC_FILES environmental variable

[Mikhail Zolotukhin]

gikari created this revision.
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REVISION SUMMARY
  If the above variable is set and it does not contain multiple paths,
  write GTK2 config into the designated config file, instead of the
  default one.
  
  BUG: 415770
  FIXED-IN: 5.18.0

TEST PLAN
  Check if the custom file provided by env variable is modified, when changing any settings, that are synchronized by kded module (icon theme, cursor theme etc)
  Simple test:
  
  1. `mv ~/.gtkrc-2.0 ~/.gtkrc-2.0.bak`
  2. `export GTK2_RC_FILES=~/.gtkrc-2.0.bak`
  3. Restart kded5 with the above env variable
  4. Change e.g. icon theme and see, that `.gtkrc-2.0.bak` is modified, but `.gtkrc-2.0`

REPOSITORY
  R99 KDE Gtk Configuration Tool

BRANCH
  show-some-respect-to-gtk2-env-variable (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D26375

AFFECTED FILES
  kded/configeditor.cpp

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