Created attachment 181819 [details]
Writer doc with Dummy Text showing Word Completion result by pressing Enter. Image of settings incl.
In Writer 126.96.36.199 and 188.8.131.52 (new parallel installation)
When Word Completion is enabled and *Show as tip* is disabled then pressing *Enter* key when suggested word is shown adds the remainder of the word twice. For example, type `dis`, the suggestion is `dis`appeared but on pressing *Enter* then the word disappearedappeared is entered.
Pressing the *Space* key instead completes the word normally as expected
By description, seems duplicate.
*** This bug has been marked as a duplicate of bug 150331 ***