We are running latest build of Qt.
I noticed a strange behavior in TextEdit:
If you concatenate the string and assign it to text property of TextEdit, and when trying to select those text - in a result some new empty lines appear in the TextEdit.
Also very important thing is :
In the end of each line of text i am concatenated there is an escape symbol ("\n") and the number of empty lines are equal to number of lines you trying to select.
So somehow that escape symbol not taking to account when the text is selecting, causing creating empty lines.
Minimal reproduction code is added, as well as small video.
With Best Regards