I need help inserting a button inside in a QLineEdit that can call a function. For example, like this google image:

I have derived the class of QTabBar to implement "+" (new tab button) button using QToolButton (similar to google chrome). However, it is working in my Linux machine but doesn't work in my windows ...

I'm new to Qt and the difference between QPushButton and QToolButton is not so clear to me. I know that a QToolButton is usually used in a QToolBar and it usually shows only an icon, without text,...