DocumentContentCompletion: Don't propose word under cursor

... unless it is already contained in the text.

For the following text:

  Lorem ipsum dolor sit amet,
  consetetur sadipscing elitr.

Typing "con|" now should only provide "consetetur"
as proposal, as "con" is just currently typed and
therefore no valid completion.

This avoids pressing line down before the first
valid proposal is available.

The exception is, if "con" would already be used
elsewhere in the text.

Change-Id: I7034f4b2b2ebe70e98acc616fb7590118faac0af
Reviewed-by: David Schulz <david.schulz@qt.io>

0 files changed, 0 insertions, 0 deletions