I am using KDevelop5. Everytime it appears some auto-completed words, I cannot choose it by my keyboard and it just can be chose by my mouse.
When I enter "Enter", it just print a "Enter" and go to the next line, but not choose the first auto-completed word.And I also cannot choose the next one by the "down" key.
How to fix it?Thanks.

Never heard of this problem. What window manager are you using? Where did you install KDevelop from, and what version?