D20935: sonnet: provide override to force of a specific plugin

[René J.V. Bertin]

rjvbb created this revision.
rjvbb added a reviewer: Frameworks.
Herald added a project: Frameworks.
rjvbb requested review of this revision.

REVISION SUMMARY
  This provides an env.var-based mechanism to force the use of a specific spell checking plugin.
  
  A warning is printed when a plugin is ignored that would otherwise be used, and care is taken not to print any further warnings for that plugin.

TEST PLAN
  Works as intended.
  
  I see this mostly as a testing facility so have not added any documentation about it - yet. Should I?

REPOSITORY
  R246 Sonnet

REVISION DETAIL
  https://phabricator.kde.org/D20935

AFFECTED FILES
  src/core/loader.cpp

To: rjvbb, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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