D24709: Remove some warnings about unused return values.

[Glen Ditchfield]

gjditchfield added a comment.


  I don't know the rules for changing interfaces.
  
  AttachmentModel::addAttachment() always returns true (and I think that is not a mistake), and only has 1 caller I know of; maybe it should be eliminated?
  
  Removing the return value of Item::appendChildItem() would require a matching change to ItemPrivate::insertChildItem<>(), but that looks OK to me.
  
  The return value from RichTextComposerSignatures::replaceSignature() is used in some places.

REPOSITORY
  R94 PIM: Message Library

REVISION DETAIL
  https://phabricator.kde.org/D24709

To: gjditchfield
Cc: mlaurent, kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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