The crash was introduced with the commit 951cb9c35d7a9ef814b3de5b359915968da9b881

Author: Frank Reininghaus <frank78ac@googlemail.com>
Date:   Mon Nov 5 22:03:52 2012 +0100

    Prevent crashes caused by nested event loops run when renaming inline
    
    When renaming inline and starting a drag or invoking the context menu,
    a nested event loop will be run. If the role editor loses focus and
    emits roleEditingFinished(), we must prevent that deleteLater() is
    called because this would delete the role editor inside a nested event
    loop which is run from one of its own functions. We would get a crash
    when returning from that event loop otherwise.
    
    BUG: 308018
    BUG: 309421
    FIXED-IN: 4.9.4

Reproducible: Always

Steps to Reproduce:
1. Use inline-renaming instead of rename-dialog
2. Select a file
3. Start renaming
4. Accept changes with RETURN key.
Actual Results:  
Crash -> File not renamed

Expected Results:  
Don't Crash -> Rename the file

It works fine when you accept the changes with focus losing (click with the mouse outside the inline-renaming box) => It only crashes with RETURN key

A have already tried to fix that with Locking (QMutex, QMutexLocker), but that didn't work.

An "ugly" but working fix is, when we replace the line emitRoleEditingFinished(); (kitemlistroleeditor.cpp line 147) with clearFocus();
=> So the event KItemListRoleEditor::event(QEvent* event) is only called once instead of two times, when you press the return key.