D9734: [KFileItemActions] Allow specifying the number of selected files required for an action

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Frameworks, dfaure, michaelh, mlaurent.
Restricted Application added a project: Frameworks.
broulik requested review of this revision.

REVISION SUMMARY
  This was mostly prompted by https://phabricator.kde.org/D9698 since Kompare can only compare two files and it makes no sense to offer this option for less or more than that.
  It is done as a QStringList so you could specify multiple criteria, e.g. only show for 2 or 4 files.
  If the need should arise, this could be made more sophisticated by adding support for e.g. ranges and less than/more than operators, but let's keep it simple for now.
  
  CHANGELOG: KonqPopupMenu/Plugin can now use the X-KDE-RequiredNumberOfUrls key to require a certain number of files to be selected before being shown

TEST PLAN
  Added
  
    X-KDE-RequiredNumberOfUrls=2
  
  to the desktop file, action showed up only when I selected two files.
  Also tested `2,4` where it would show up if 2 or 4 files are selected
  
  Older KIO versions would just ignore that key and always show the action, which is fine.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D9734

AFFECTED FILES
  src/widgets/kfileitemactions.cpp

To: broulik, #frameworks, dfaure, michaelh, mlaurent
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