https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.control.textchanged?view=netframework-4.8.1
Control.TextChanged Event (System.Windows.Forms) | Microsoft Learn
Occurs when the Text property value changes.
event systemwindows formscontrolmicrosoftlearn
https://forum.qt.io/topic/22358/solved-unable-to-accessing-signal-textchanged-from-base-qlineedit-class
[solved] unable to accessing signal 'textChanged' from base 'QLineEdit' class | Qt Forum