When a character that is combined (two glyphs into one character) is placed at the end of a line in QTextEdit then it is possible to delete only part of it

When a character that is combined (two glyphs into one character) is placed at the end of a line in QTextEdit then it is possible to delete only part of it.

In the attached example, if you click at the end of the first line and then press backspace it will convert the last character to an invalid one instead of deleting it outright. If that character is not at the end of the line then it gets deleted correctly.