a textedit text color problem

[lfmissonb]

When I append text1 with green color, and select the green text, then append text2 without <font> label, but text2 become green too:
Step I: click "add text green color"

Step II: select "green text"

Step III: click "add text unset color"

If I don't select the green text1 to append text2, text2 will be white (or black in light theme):
Step I: click "add text green color"

Step II: click "add text unset color"

PySide6(Qt6 for Python): 6.7.2
My Code:

import sys
from PySide6 import QtWidgets

app = QtWidgets.QApplication(sys.argv)

win = QtWidgets.QMainWindow()
central = QtWidgets.QWidget(win)
win.setCentralWidget(central)
layout = QtWidgets.QVBoxLayout(central)
central.setLayout(layout)

text_edit = QtWidgets.QTextEdit(central)
layout.addWidget(text_edit)

add_normal_text_btn = QtWidgets.QPushButton(central)
add_normal_text_btn.setText("add text unset color")
add_normal_text_btn.clicked.connect(lambda: text_edit.append("normal text"))
layout.addWidget(add_normal_text_btn)

add_green_text_btn = QtWidgets.QPushButton(central)
add_green_text_btn.setText("add text green color")
add_green_text_btn.clicked.connect(lambda: text_edit.append("<font color=\"green\">green text</font>"))
layout.addWidget(add_green_text_btn)

win.show()

sys.exit(app.exec())

[JonB]

@lfmissonb
I can only guess/suggest that when you append your "unset color text" (which btw does not unset any color, perhaps it should) the QTextEdit/QTextDocument makes a guess whether to continue from existing selected text or not. So you get what you get. I suspect the Qt folks will say this is "by design" or "unspecified", so you will need to experiment with what works/does not work when it updates the HTML to get what you want.

[lfmissonb]

@JonB
Thank you. I found that I shouldn't only append "normal text", I should append "<font>normal text</font>" instead, and the "normal text" will not be green.

[JonB]

@lfmissonb Indeed, because that specifies its own font (and so color) for the fragment you are adding.