pyside6 QLineEdit, QTextEdit, QPlainTextEdit, QTableWidget Korean combination Error

pyside6 There is a problem with Korean input when using QLineEdit and all QxxxEdit.

There is a problem that the Korean combination with 'ㄲㅗㄹ' is not possible when entering '꼴' with the keyboard.

I think this problem is similar to 'Qt CreatorQTCREATORBUG-27476'.

'ㅃ', 'ㅉ', 'ㄸ', 'ㄲ', and 'ㅆ' are special Korean consonants and are expressed as 'ㅃ' when Shift + 'ㅂ'.
I prepared the following code to analyze this problem. 

class MyWidget(QtWidgets.QWidget):

 def _init_(self):
    super()._init_()
    self.text_edit = QLineEdit()
    self.text_edit.setAttribute(Qt.WA_InputMethodEnabled)
    self.text_edit.inputMethodEvent = self.print_korean
    self.text_edit.keyReleaseEvent = self.process_key

def process_key(self, event):
    print('AlphabetEvent=', event)

def print_korean(self, event):
    print('KoreanEvent=', event)
    print('\tpreeditString=(%s)'% event.preeditString(), '(%d)'% len(event.preeditString()))
    print('\tcommitString=(%s)'% event.commitString(), '(%d)'% len(event.commitString()))

This is the test result.

AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_A, text="a")>
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_B, text="b")>
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_C, text="c")>
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_D, text="d")>
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_Space, text=" ")>
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\u314e'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(ㅎ) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\ud558'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(하) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\ud55c'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(한) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\ud55c'")>
preeditString=() (0)
commitString=(한) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\u3131'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(ㄱ) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uadf8'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(그) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uae00'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(글) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\uae00'")>
preeditString=() (0)
commitString=(글) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\u3147'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(ㅇ) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc774'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(이) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc789'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(잉) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\uc774'")>
preeditString=() (0)
commitString=(이) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc57c'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(야) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc597'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(얗) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\uc57c'")>
preeditString=() (0)
commitString=(야) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\ud638'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(호) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent()>
preeditString=() (0)
commitString=() (0)
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, 0, text="ȣ")>
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_Space, text=" ")>
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\u3146'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(ㅆ) (1)
commitString=() (0)
AlphabetEvent= <PySide6.QtGui.QKeyEvent(KeyRelease, Key_Shift)>
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc2f8'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(싸) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc30d'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(쌍) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\uc30d'")>
preeditString=() (0)
commitString=(쌍) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\u3148'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(ㅈ) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc790'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(자) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc7a5'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(장) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(, commit="U+'\uc790'")>
preeditString=() (0)
commitString=(자) (1)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc73c'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(으) (1)
commitString=() (0)
KoreanEvent= <PySide6.QtGui.QInputMethodEvent(preedit="U+'\uc74c'", attributes=

{[type= 0, start=0, length=1, value=QVariant(QTextFormat, QTextFormat(QTextFormat::FormatType(2)))],[type= 1, start=0, length=0, value=QVariant(Invalid)]}

)>

preeditString=(음) (1)
commitString=() (0)
 
And it was assumed that the simultaneous occurrence of the Shift key event was the cause of this problem.
 

Afterwards, as a temporary solution, I was able to avoid the korean combination problem by receiving the Shift event as follows.

 
  self.text_edit.keyReleaseEvent = self.process_key
def process_key(self, event):
   pass

 
The core of the problem is that the Shift key pressed at the same time should be ignored when entering special characters such as 'ㅃ'.

I hope this issue will be resolved soon.