I just watched the "What's New with 10.4.2" Embarcadero video. It sounds like there was a lot of quality code fixes put in place. One thing that surprised me is the ability to open the Form Designer and Code Editor in separate windows. Each fully functionable and editable.
The video is over 4 hours long. the first 43+ minutes are the new feature presentations. The remaining 3+ hours is a question and answer session. I have not listened to the Q&A. McKeeth did create a separate google docs of the Q&A.
Here are the topics with timestamp jumps.
Introduction
https://youtu.be/AZ4ba9Tf3qE
Jim McKeeth
Overview of RAD Studio 10.4
https://youtu.be/AZ4ba9Tf3qE?t=65
Sarina DuPont
What's New in 10.4.2
https://youtu.be/AZ4ba9Tf3qE?t=284
Sarina DuPont
Best-in-Class Windows Application Support
https://youtu.be/AZ4ba9Tf3qE?t=314
Marco Cantu
New TControlList VCL Component
https://youtu.be/AZ4ba9Tf3qE?t=401
Marco Cantu
New TNumberBox VCL Component
https://youtu.be/AZ4ba9Tf3qE?t=497
Marco Cantu
MSIX and Windows Store Support
https://youtu.be/AZ4ba9Tf3qE?t=529
Marco Cantu
More VCL Improvements
Upgraded Konopka Components (KSVC)
Enhanced TEdgeBrowser VCL Component
https://youtu.be/AZ4ba9Tf3qE?t=582
Marco Cantu
Demo TNumberBox
https://youtu.be/AZ4ba9Tf3qE?t=688
Jim McKeeth
Demo TControlList
https://youtu.be/AZ4ba9Tf3qE?t=849
Jim McKeeth
New Developer Productivity and UX Features
https://youtu.be/AZ4ba9Tf3qE?t=1157
David Millington
Demo IDE & Code Insight (LSP)
https://youtu.be/AZ4ba9Tf3qE?t=1602
David Millington
Form Designer & Code Editor in separate windows
https://youtu.be/AZ4ba9Tf3qE?t=1680
David Millington
New Delphi Compiler Enhancements
https://youtu.be/AZ4ba9Tf3qE?t=2115
Marco Cantu
C++ Changes
https://youtu.be/AZ4ba9Tf3qE?t=2193
David Millington
General Quality Enhancements
https://youtu.be/AZ4ba9Tf3qE?t=2291
David Millington & Marco Cantu
RAD 10.4.2 SKUs
https://youtu.be/AZ4ba9Tf3qE?t=2551
Marco Cantu
Enjoy,
Gunny Mike
Semper Fi
https://zilchworks.com