QLineEdit with Password echo mode allows non-ascii IME input

When writing text in password field with IME, the text being composed is visible and is also allowed as entry to the password text.

Qt 4.x did not allow non-ascii text to be inserted in password mode, the IME was disabled for the QLineEdit.

Steps to reproduce:

• Run attached sample
• Write text with IME
• EXPECTED: Only the entered ascii letters are accepted
• ACTUAL: Non-ascii letters are accepted, and when composing those non-ascii letters/words (i.e. word being composed out of kanjis in Japanese), the composed word is visible until it has been accepted with enter-key