In Qt Creator from the Qt 5.0.0 packages I can not trigger copy, cut nor paste via the keyboard in the snippets editor. Triggering any of these via the context menu works.

How to reproduce:

1. Open Qt Creator
2. Go to Tools>Options>Text Editor>Snippets
3. Select any snippet there
4. Highlight a section of the snippet in the editor shown in the lower half of the window.
5. Try to cut/copy/paste if with the keyboard: This is ignored.
6. Try to cut/copy/paste via the context menu: This works.

Cut/Copy/Paste works with the keyboard as well as via the context menu with a Qt 4 based build of Qt Creator.