- emit textEdited and textChanged when "accepting the autocompletion"
- don't emit textChanged/textEdited twice when going up or down in the completion popup

The updated behavior is therefore:
* setText emits textChanged and userTextChanged, but not textEdited
* typing emits all three signals
* the suggestion from auto completion emits textChanged but not userTextChanged nor textEdited
* accepting the autocompletion suggestion now emits all three signals too
* selecting an item in the popup completion changes the lineedit text and emits all 3 signals
* pressing Enter in the popup completion doesn't emit anything, the text is already there

This makes textEdited useful again, so userTextChanged is now deprecated (okayed by Jacopo).
CCMAIL: germain@ebooksfrance.org

svn path=/trunk/KDE/kdelibs/; revision=1120672