FakeVim eats one keypress directly after showing auto-completion popup (<= Qt 5.2)

When using the FakeVim mode together with autocompletion, the first key-press after the completion window popped up does not reach the editor, interrupting your continous typing experience.

This bug occured for me when compiling Qt Creator master branch with Qt 5.2 as supplied by the Ubuntu 14.04 packages.

However, it does not occur when compiling Qt 5.3.1 manually, and then building Qt Creator against this newer Qt version.

Thus, this bug-report is mainly about letting others now about the solution:
Simply build yourself a new Qt, its very easy