News of an unsubstantiated rumour about code disappearing in Delphi 8 has appeared recently from an anonymous source.
When using Delphi 8, it might occur when switching back to the designer after directly modifying the aspx file to change some HTML markup.
It also occured when switching to the Delphi source file, and then expanding the InitializeComponents method.
It was also reported to occur when toggling between F11 and F12 in a row too much, or too quickly.
Developers should pay more attention, as your web pages may fail to run properly.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes