D15557: Improve "insufficient disk space" error messgae

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Frameworks, VDG, Dolphin, shubham.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  The prior error was misleading, and always said "Disk full." even when the disk wasn't actually full; not having enough space to move or copy the requested file doesn't mean that the disk is full! This patch re-words the error message to be clearer and still work when `errorString` is defined (as it always should be).

TEST PLAN
  Before:
  
  After:

REPOSITORY
  R241 KIO

BRANCH
  improve-insufficient-disk-space-error-message (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D15557

AFFECTED FILES
  src/core/job_error.cpp

To: ngraham, #frameworks, #vdg, #dolphin, shubham
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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