This goes with bug report https://bugs.kde.org/show_bug.cgi?id=388798
The unit test of kLineEdit was previously checking incorrectly that textEdited _HAD_ been emitted when the text is changed with setText(). This is undesired behaviour.
This patch fixes the unit test, and changes the problematic behaviour by removing the extra emission of textEdited in the private signal _k_textChanged.
In addition this is the underlying cause of bug https://bugs.kde.org/show_bug.cgi?id=373004 in kdevelop (and probably several others).