D13805: Present error dialog when user tries to create directory named "." or ".."

[Thomas Marshall]

tmarshall created this revision.
tmarshall added a reviewer: Dolphin.
tmarshall added a project: Dolphin.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
tmarshall requested review of this revision.

REVISION SUMMARY
  BUG: 387449
  
  In Dolphin, when a user tries to create a folder named "." or "..", they are presented with a dialog that informs them that since the folder name they entered begins with a ".", the folder they are about to create will be hidden. This is, of course, misleading. This patch instead presents them with a similar dialog, informing them of the error and asking them for a new name.
  
  Before:
  
  F5976307: image.png <https://phabricator.kde.org/F5976307>
  
  After:
  
  F5976315: image.png <https://phabricator.kde.org/F5976315>

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D13805

AFFECTED FILES
  src/filewidgets/knewfilemenu.cpp

To: tmarshall, #dolphin
Cc: kde-frameworks-devel, michaelh, spoorun, navarromorales, isidorov, firef, ngraham, andrebarros, bruns, emmanuelp
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