D7386: [AdditionalInfoDialog] Prevent hiding "text" role

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a subscriber: Konqueror.

REVISION SUMMARY
  You cannot do this from the menu but the option was there (but ignored) in the "View Properties" dialog.
  
  BUG: 302622

TEST PLAN
  "Name" is now grayed out and cannot be unchecked
  F3867143: Screenshot_20170818_142659.png <https://phabricator.kde.org/F3867143>

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D7386

AFFECTED FILES
  src/settings/additionalinfodialog.cpp

To: broulik, #dolphin
Cc: #konqueror
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