To reproduce:

• Install Korean language pack
• Switch to Korean IME
• Note taskbar icon to the left of IME icon displaying 'A': Click on it to toggle Hangul
• Type text, press ENTER
• Note assert

i have installed Qt 5.2 , but i have found key input assert.

Test Situation, In *Korean* Windows 7, 8, 8.1 ....

1. In Qt Designer, new mainwindow form, click menubar's 'input here', edit korean text, and Qt designer shutdown

2. In QLineEdit, ... QtWidgets . I input Korean message assert like below pictures.

http://s27.postimg.org/3n70y42wz/QT_5_2_0.jpg

i very disappointed this assert.