(it works even if I can't see a good reason to allow this, other than
   not dying when the clipboard image-demarshalling code fails and pastes a
   border, instead of a contentful-image-selection)

* Fix crash when pasting into a text box that has no content, by giving
  text boxes content (kpToolTextGiveContentCommand) before inserting text
  [kpMainWindow::pasteText()]

* Avoid unnecessary heap allocation and destruction [kpMainWindow::pasteText()]

* Fix further crash when pasting into a text box with the MMB button
  [kpMainWindow::pasteTextAt()]


svn path=/trunk/KDE/kdegraphics/kolourpaint/; revision=708928